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WP_Rewrite{} WP 1.5

Класс ядра, который разбирает запрашиваемый URL (ЧПУ) и создает из него понятный для WordPress "внутренний" URL. Этот класс используется как API для создания ЧПУ (человеко-понятных ссылок).

С помощью этого класса WordPress понимает какую страницу нужно показать: страницу записи, категории, архива и т.д. Например, мы запрашиваем страницу http://example.com/mypage WP_Rewrite разбирает этот ЧПУ и переделывает его в вид: http://example.com/index.php?pagename=mypage, а дальше WordPress работает с параметрами запроса. Параметры запроса фильтруются через "белый список" и остаются там только разрешенные. Нужно это для защиты. Получить значение любой переменной запроса можно с помощью функции get_query_var().

Работа класса WP_Rewrite тесно связана с классом WP{}. WP_Rewrite разбирает и делает понятным для WordPress текущий URL (ЧПУ), а WP создает и обрабатывает "уже понятный URL" и на основе результата устанавливает глобальные переменные, и выдает нужную страницу сайта.

С помощью класса WP_Rewrite можно научить WordPress понимать ЧПУ любого рода. Также, можно научить пропускать указанные URL на уровне файла .htaccess (см. метод WP_Rewrite::add_external_rule($regex, $query)).

Этот класс работает только для внешней части сайта (фронтенда). В админке ЧПУ не используются.

Правила перезаписи ЧПУ в понятный URL сохраняются в базе данных, в таблице wp_options, опция rewrite_rules. Опция обновляется при обновлении «постоянных ссылок» в админке WordPress или при сбросе правил с помощью flush_rewrite_rules().

Возвращает

Экземпляр класса.

Свойства класса

$permalink_structure(строка)
Структура ЧПУ для постов.
По умолчанию: null
$use_trailing_slashes(логический)
Нужно ли добавлять замыкающий слэш на конце ссылок?
По умолчанию: null
$author_base(строка)
База для ЧПУ страницы авторов: example.com/$author_base/authorname
По умолчанию: 'author'
$author_structure(строка)
Структура ЧПУ для архива авторов.
По умолчанию: null
$date_structure(строка)
Структура ЧПУ для архива даты.
По умолчанию: null
$page_structure(строка)
Структура ЧПУ для постоянных страниц.
По умолчанию: null
$search_base(строка)
База для ЧПУ страницы поиска: example.com/$search_base/query
По умолчанию: 'search'
$search_structure(строка)
Структура ЧПУ для страницы поиска.
По умолчанию: null
$comments_base(строка)
База для ЧПУ комментария.
По умолчанию: 'comments'
$pagination_base(строка)
База для ЧПУ пагинации.
По умолчанию: 'page'
$comments_pagination_base(строка)
База для ЧПУ пагинации комментария.
По умолчанию: 'comment-page'
$feed_base(строка)
База для ЧПУ фида.
По умолчанию: 'feed'
$comment_feed_structure(строка)
Структура ЧПУ для URL фида.
По умолчанию: null
$feed_structure(строка)
Структура ЧПУ для URL под запрос (request) фида.
По умолчанию: null
$front(строка)
Префикс структуры ЧПУ. Если структура ЧПУ выглядит так: /ID-%post_id%, тогда префикс будет равен /ID-. А если так: /%year%/%postname%/, то префикс = /.
Подробнее смотрите: WP_Rewrite::init()
По умолчанию: null
$root(строка)
Префикс для всех структур ЧПУ.
Если используется структура PATHINFO или index, то этот параметр равен значению свойства WP_Rewrite::$index с замыкающим слэшем на конце.
Смотрите: WP_Rewrite::init()
Смотрите: WP_Rewrite::using_index_permalinks()
По умолчанию: ''
$index(строка)
Название файла, на который должны передаваться все запросы.
По умолчанию: 'index.php'
$matches(строка)
Название переменной которая будет использоваться в регулярных выражениях в строке результирующего запроса, пр.: index.php?pagename=$matches[1].
По умолчанию: ''
$extra_rules(массив)
Дополнительные правила перезаписи, добавленные в класс из вне.
Они не создаются классом автоматически. Подробнее см.: add_rewrite_rule().
По умолчанию: array()
$rules(массив)
Правила перезаписи URL на основе которых будет получен текущий запрос или сделан редирект. Это, можно сказать, основное свойство в котором хранятся все основные правила перезаписи URL.
По умолчанию: null
$extra_rules_top(массив)
Дополнительные правила перезаписи, которые будут выполняться в самом начале, т.е. раньше правил из свойств: $extra_rules и $rules.
Они не создаются классом автоматически. Подробнее см.: add_rewrite_rule().
По умолчанию: array()
$non_wp_rules(массив)
Правила которые не перенаправляют (не смотрят) на файл index.php.
Эти правила записываются в порцию правил mod_rewrite в .htaccess. Для добавления таких правил используйте метод WP_Rewrite::add_external_rule($regex, $query).
По умолчанию: array()
$extra_permastructs(массив)
Дополнительные структуры ЧПУ, например к ним относятся ЧПУ рубрик, которые добавляются с помощью функции add_permastruct().
По умолчанию: array()
$use_verbose_rules(логический)
Если установить в true, то все правила перезаписи будут записываться как правила mod_rewrite в файле .htaccess.
По умолчанию функция отключена, включение этой опции добавить много правил в .htaccess.
Смотрите также: WP_Rewrite::mod_rewrite_rules()
По умолчанию: false
$endpoints(массив)
Конечные точки наподобие /trackback/ для типов ЧПУ (например для постов и страниц), добавляются функцией add_rewrite_endpoint( $name, $places ).
По умолчанию:
$use_verbose_page_rules(логический)

Похожа ли структура ЧПУ постов на структуру постоянных страниц?

Если первый тег в ЧПУ постов может быть похож на название страницы, например ЧПУ начинается с %postname% или %author%, то может быть путаница, в таких случаях нужно установить этот флаг в true, для дополнительной проверки типа записи.

До версии 3.3. этот флаг выставлял ЧПУ страниц вверх всех правил, чтобы они проверялись первыми. А теперь этот флаг говорит WP::parse_request() проверять URL на схожесть со структурой страниц и если это так, то перед принятием ЧПУ проверяется тип записи - действительно ли это страница.
По умолчанию: true

$rewritecode(массив)

Теги перезаписи, которые могут быть использованы в структуре ЧПУ. Добавляются с помощью функции add_rewrite_tag().

Эти теги переводятся в соответствующие части регулярного выражения, которые указываются в свойстве $rewritereplace, а затем части регулярного выражения переписываются в соответствующую часть запроса, которая находится в свойстве $queryreplace.

По умолчанию:

array(
	'%year%',
	'%monthnum%',
	'%day%',
	'%hour%',
	'%minute%',
	'%second%',
	'%postname%',
	'%post_id%',
	'%author%',
	'%pagename%',
	'%search%'
)
$rewritereplace(массив)

Части регулярного выражения, которыми будет заменен тег из свойства $rewritecode.

По умолчанию:

array(
	'([0-9]{4})',
	'([0-9]{1,2})',
	'([0-9]{1,2})',
	'([0-9]{1,2})',
	'([0-9]{1,2})',
	'([0-9]{1,2})',
	'([^/]+)',
	'([0-9]+)',
	'([^/]+)',
	'([^/]+?)',
	'(.+)'
)
$queryreplace(массив)

Параметры запроса, значение которого будет установлено из вхождения части регулярного выражения из свойства $rewritereplace.

По умолчанию:

array(
	'year=',
	'monthnum=',
	'day=',
	'hour=',
	'minute=',
	'second=',
	'name=',
	'p=',
	'author_name=',
	'pagename=',
	's='
)
$feeds(массив)
Поддерживаемые фиды.
По умолчанию: array( 'feed', 'rdf', 'rss', 'rss2', 'atom' )
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Методы класса

__construct()
Конструктор - вызывает метод init().
add_endpoint( $name, $places, $query_var = true )
Добавляет конечную точку, например /trackback/. Добавляются дополнительные правила перезаписи ЧПУ с указанной конечной точкой. Смотрите описание функции add_rewrite_endpoint().
add_external_rule( $regex, $query )
Добавляет правила перезаписи, которое не относится к WordPress к файлу index.php.
add_permastruct( $name, $struct, $args = array() )
Позволяет добавить дополнительную структуру постоянных ссылок для создания ЧПУ. Смотрите описание функции add_permastruct().
add_rewrite_tag( $tag, $regex, $query )
Добавляет/обновляет тег запроса (например '%pagetype%') который можно использовать в ЧПУ. Смотрите описание функции add_rewrite_tag().
add_rule( $regex, $query, $after = 'bottom' )
Добавляет дополнительное правило перезаписи URL (ЧПУ) во внутренний url wordpress с параметрами запроса. Создает дополнительное правило. Смотрите описание функции add_rewrite_rule().
flush_rules( $hard = true )
Обновляет правила перезаписи ссылок (ЧПУ) в базе данных и кэше. Смотрите описание функции flush_rewrite_rules().
generate_rewrite_rule( $permalink_structure, $walk_dirs = false )
Создает правила на основе указанной ЧПУ структуры. Правила создаются только для директорий указаны в ЧПУ (параметр walk_dirs из функции add_permastruct()). Это урезанный вызов метода generate_rewrite_rules()
generate_rewrite_rules( $permalink_structure, $ep_mask = EP_NONE, $paged = true, $feed = true, $forcomments = false, $walk_dirs = true, $endpoints = true )
Создает правила перезаписи на основе указанной ЧПУ структуры.
get_author_permastruct()
Получает структуру ЧПУ для страницы автора.
get_category_permastruct()
Получает структуру ЧПУ для страницы рубрик.
get_comment_feed_permastruct()
Получает структуру ЧПУ для страницы фида комментариев.
get_date_permastruc()
Получает структуру ЧПУ для страницы даты: год, месяц и день.
get_year_permastruct()
Получает структуру ЧПУ для страницы года: дата без дня и месяца.
get_month_permastruct()
Получает структуру ЧПУ для страницы месяца: дата без дня.
get_day_permastruct()
Получает структуру ЧПУ для страницы дня. Идентично get_date_permastruc().
get_extra_permastruct( $name )
Получает произвольную структуру ЧПУ указанную в параметре $name.
get_feed_permastruct()
Получает структуру ЧПУ для страницы фида.
get_page_permastruct()
Получает структуру ЧПУ для постоянной страницы.
get_search_permastruct()
Получает структуру ЧПУ для страницы поиска.
get_tag_permastruct()
Получает структуру ЧПУ для страницы меток.
iis7_url_rewrite_rules()
Получает правила перезаписи в формате IIS7 для записи в файл web.config.
init()
Инициализация всего класса, устанавливает свойства объекта.
mod_rewrite_rules()
Получает правила перезаписи предназначенные для записи в файл .htaccess.
page_rewrite_rules()
Получает все правила перезаписи для постоянных страниц.
page_uri_index()

Получает пути URL всех постоянных страниц и их вложений. Вернет такой массив:

Array (
	[0] => Array (
			[about/portfolio] => 3644
			[about] => 7
		)

	[1] => Array (
			[about/photo1] => 824
			[about/photo2] => 5484
		)
)
preg_index( $number )
Индексы для вхождений используемых в функциях preg_*().
remove_permastruct( $name )
Удаляет структуру ЧПУ по названию. См. remove_permastruct()
remove_rewrite_tag( $tag )
Удаляет тег перезаписи. См. remove_rewrite_tag()
rewrite_rules()
Создает правила перезаписи и соответствующие им запросы на основе структур ЧПУ. Создаваемые правила сохраняются в опцию get_option( 'rewrite_rules' ) при вызове метода wp_rewrite_rules().
set_category_base( $category_base)
Устанавливает базу категорий для URL категорий.
set_permalink_structure( $permalink_structure )
Устанавливает основную структуру ЧПУ для сайта.
set_tag_base( $tag_base )
Устанавливает базу меток для URL меток.
using_index_permalinks()
Определяет используются ли ЧПУ для index.php и модуль перезаписи не активирован.
using_mod_rewrite_permalinks()
Определяет используются ли ЧПУ для mod_rewrite и модуль перезаписи не активирован.
using_permalinks()
Определяет используются ли ЧПУ.
wp_rewrite_rules()
Получает все правила перезаписи которые возвращает метод rewrite_rules(). И обновляет опцию get_option( 'rewrite_rules' ).
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Функции-обертки для класса WP_Rewrite

Для удобного использования WP_Rewrite в wordpress существуют функции-обертки:

  • add_rewrite_rule() - Добавляет правила для ЧПУ. Создает дополнительные правила перезаписи УРЛ.

  • add_rewrite_tag() - Добавляет переменную запроса в WordPress. ?pagetype=mypage, здесь pagetype — переменная запроса.

  • remove_rewrite_tag() - Удаляет существующий тег запроса, например %postname%.

  • flush_rewrite_rules() - Обновляет правила перезаписи ЧПУ: удаляет имеющиеся, генерирует и записывает новые.

  • add_permastruct() - Позволяет добавить дополнительную структуру постоянных ссылок для создания ЧПУ.

  • remove_permastruct() - Удаляет ранее добавленную структуру ЧПУ (постоянных ссылок).
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Хуки класса WP_Rewrite для плагинов

Так как ЧПУ - это часть системы и функционала сайта, WordPress позволяет внедряться в процесс генерации правил перезаписи URL. Метод rewrite_rules() содержит 9 фильтров:

  • post_rewrite_rules - изменяет правила перезаписи URL постов. Передает: $post_rewrite
  • date_rewrite_rules - изменяет правила перезаписи URL дат. Передает: $date_rewrite
  • {$permastructname}_rewrite_rules - изменяет правила перезаписи любой структуры ЧПУ, название указывается в $permastructname. Передает: $rules
  • search_rewrite_rules - правила перезаписи URL поиска.
  • comments_rewrite_rules - правила перезаписи URL фида последних комментариев: /comments/feed/.
  • author_rewrite_rules - правила перезаписи URL авторов.
  • page_rewrite_rules - правила перезаписи URL постоянных страниц.
  • root_rewrite_rules - правила перезаписи URL корня сайта.
  • generate_rewrite_rules - это событие срабатывает после того, как все правила созданы. Передает весь объект WP_Rewrite по ссылке.
  • rewrite_rules_array - изменяет все правила перезаписи в одном массиве. Фильтр срабатывает в самом конце.

  • mod_rewrite_rules - изменяет все правила, аналог фильтра generate_rewrite_rules только для правил файла .htaccess.
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Примеры

#1 Как выглядит глобальная переменная $wp_rewrite

WP_Rewrite Object
(
	[permalink_structure] => /id_%post_id%/%postname%.html
	[use_trailing_slashes] => 
	[author_base] => author
	[page_structure] => %pagename%
	[search_base] => search
	[comments_base] => comments
	[pagination_base] => page
	[comments_pagination_base] => comment-page
	[feed_base] => feed
	[front] => /id_
	[root] => 
	[index] => index.php
	[matches] => 
	[rules] => Array
		(
			[(filecode)(/.*)$] => index.php?pagename=$matches[1]&file_path=$matches[2]
			[(sitemap)/([^/]*)/?] => index.php?pagename=$matches[1]&pagetype=$matches[2]
			[article/?$] => index.php?post_type=article
			[article/feed/(feed|rdf|rss|rss2|atom)/?$] => index.php?post_type=article&feed=$matches[1]
			[article/(feed|rdf|rss|rss2|atom)/?$] => index.php?post_type=article&feed=$matches[1]
			[article/page/([0-9]{1,})/?$] => index.php?post_type=article&paged=$matches[1]
			[cat/(.+?)/feed/(feed|rdf|rss|rss2|atom)/?$] => index.php?category_name=$matches[1]&feed=$matches[2]
			[cat/(.+?)/(feed|rdf|rss|rss2|atom)/?$] => index.php?category_name=$matches[1]&feed=$matches[2]
			[cat/(.+?)/embed/?$] => index.php?category_name=$matches[1]&embed=true
			[cat/(.+?)/page/?([0-9]{1,})/?$] => index.php?category_name=$matches[1]&paged=$matches[2]
			[cat/(.+?)/?$] => index.php?category_name=$matches[1]
			[met/([^/]+)/feed/(feed|rdf|rss|rss2|atom)/?$] => index.php?tag=$matches[1]&feed=$matches[2]
			[met/([^/]+)/(feed|rdf|rss|rss2|atom)/?$] => index.php?tag=$matches[1]&feed=$matches[2]
			[met/([^/]+)/embed/?$] => index.php?tag=$matches[1]&embed=true
			[met/([^/]+)/page/?([0-9]{1,})/?$] => index.php?tag=$matches[1]&paged=$matches[2]
			[met/([^/]+)/?$] => index.php?tag=$matches[1]
			[id_type/([^/]+)/feed/(feed|rdf|rss|rss2|atom)/?$] => index.php?post_format=$matches[1]&feed=$matches[2]
			[id_type/([^/]+)/(feed|rdf|rss|rss2|atom)/?$] => index.php?post_format=$matches[1]&feed=$matches[2]
			[id_type/([^/]+)/embed/?$] => index.php?post_format=$matches[1]&embed=true
			[id_type/([^/]+)/page/?([0-9]{1,})/?$] => index.php?post_format=$matches[1]&paged=$matches[2]
			[id_type/([^/]+)/?$] => index.php?post_format=$matches[1]
			[robots\.txt$] => index.php?robots=1
			[.*wp-(atom|rdf|rss|rss2|feed|commentsrss2)\.php$] => index.php?feed=old
			[.*wp-app\.php(/.*)?$] => index.php?error=403
			[.*wp-register.php$] => index.php?register=true
			[feed/(feed|rdf|rss|rss2|atom)/?$] => index.php?&feed=$matches[1]
			[(feed|rdf|rss|rss2|atom)/?$] => index.php?&feed=$matches[1]
			[ embed/?$] => index.php?&embed=true
			[page/?([0-9]{1,})/?$] => index.php?&paged=$matches[1]
			[comments/feed/(feed|rdf|rss|rss2|atom)/?$] => index.php?&feed=$matches[1]&withcomments=1
			[comments/(feed|rdf|rss|rss2|atom)/?$] => index.php?&feed=$matches[1]&withcomments=1
			[comments/embed/?$] => index.php?&embed=true
			[search/(.+)/feed/(feed|rdf|rss|rss2|atom)/?$] => index.php?s=$matches[1]&feed=$matches[2]
			[search/(.+)/(feed|rdf|rss|rss2|atom)/?$] => index.php?s=$matches[1]&feed=$matches[2]
			[search/(.+)/embed/?$] => index.php?s=$matches[1]&embed=true
			[search/(.+)/page/?([0-9]{1,})/?$] => index.php?s=$matches[1]&paged=$matches[2]
			[search/(.+)/?$] => index.php?s=$matches[1]
			[id_author/([^/]+)/feed/(feed|rdf|rss|rss2|atom)/?$] => index.php?author_name=$matches[1]&feed=$matches[2]
			[id_author/([^/]+)/(feed|rdf|rss|rss2|atom)/?$] => index.php?author_name=$matches[1]&feed=$matches[2]
			[id_author/([^/]+)/embed/?$] => index.php?author_name=$matches[1]&embed=true
			[id_author/([^/]+)/page/?([0-9]{1,})/?$] => index.php?author_name=$matches[1]&paged=$matches[2]
			[id_author/([^/]+)/?$] => index.php?author_name=$matches[1]
			[id_date/([0-9]{4})/([0-9]{1,2})/([0-9]{1,2})/feed/(feed|rdf|rss|rss2|atom)/?$] => index.php?year=$matches[1]&monthnum=$matches[2]&day=$matches[3]&feed=$matches[4]
			[id_date/([0-9]{4})/([0-9]{1,2})/([0-9]{1,2})/(feed|rdf|rss|rss2|atom)/?$] => index.php?year=$matches[1]&monthnum=$matches[2]&day=$matches[3]&feed=$matches[4]
			[id_date/([0-9]{4})/([0-9]{1,2})/([0-9]{1,2})/embed/?$] => index.php?year=$matches[1]&monthnum=$matches[2]&day=$matches[3]&embed=true
			[id_date/([0-9]{4})/([0-9]{1,2})/([0-9]{1,2})/page/?([0-9]{1,})/?$] => index.php?year=$matches[1]&monthnum=$matches[2]&day=$matches[3]&paged=$matches[4]
			[id_date/([0-9]{4})/([0-9]{1,2})/([0-9]{1,2})/?$] => index.php?year=$matches[1]&monthnum=$matches[2]&day=$matches[3]
			[id_date/([0-9]{4})/([0-9]{1,2})/feed/(feed|rdf|rss|rss2|atom)/?$] => index.php?year=$matches[1]&monthnum=$matches[2]&feed=$matches[3]
			[id_date/([0-9]{4})/([0-9]{1,2})/(feed|rdf|rss|rss2|atom)/?$] => index.php?year=$matches[1]&monthnum=$matches[2]&feed=$matches[3]
			[id_date/([0-9]{4})/([0-9]{1,2})/embed/?$] => index.php?year=$matches[1]&monthnum=$matches[2]&embed=true
			[id_date/([0-9]{4})/([0-9]{1,2})/page/?([0-9]{1,})/?$] => index.php?year=$matches[1]&monthnum=$matches[2]&paged=$matches[3]
			[id_date/([0-9]{4})/([0-9]{1,2})/?$] => index.php?year=$matches[1]&monthnum=$matches[2]
			[id_date/([0-9]{4})/feed/(feed|rdf|rss|rss2|atom)/?$] => index.php?year=$matches[1]&feed=$matches[2]
			[id_date/([0-9]{4})/(feed|rdf|rss|rss2|atom)/?$] => index.php?year=$matches[1]&feed=$matches[2]
			[id_date/([0-9]{4})/embed/?$] => index.php?year=$matches[1]&embed=true
			[id_date/([0-9]{4})/page/?([0-9]{1,})/?$] => index.php?year=$matches[1]&paged=$matches[2]
			[id_date/([0-9]{4})/?$] => index.php?year=$matches[1]
			[id_[0-9]+/[^/]+.html/attachment/([^/]+)/?$] => index.php?attachment=$matches[1]
			[id_[0-9]+/[^/]+.html/attachment/([^/]+)/trackback/?$] => index.php?attachment=$matches[1]&tb=1
			[id_[0-9]+/[^/]+.html/attachment/([^/]+)/feed/(feed|rdf|rss|rss2|atom)/?$] => index.php?attachment=$matches[1]&feed=$matches[2]
			[id_[0-9]+/[^/]+.html/attachment/([^/]+)/(feed|rdf|rss|rss2|atom)/?$] => index.php?attachment=$matches[1]&feed=$matches[2]
			[id_[0-9]+/[^/]+.html/attachment/([^/]+)/comment-page-([0-9]{1,})/?$] => index.php?attachment=$matches[1]&cpage=$matches[2]
			[id_[0-9]+/[^/]+.html/attachment/([^/]+)/embed/?$] => index.php?attachment=$matches[1]&embed=true
			[id_([0-9]+)/([^/]+).html/embed/?$] => index.php?p=$matches[1]&name=$matches[2]&embed=true
			[id_([0-9]+)/([^/]+).html/trackback/?$] => index.php?p=$matches[1]&name=$matches[2]&tb=1
			[id_([0-9]+)/([^/]+).html/feed/(feed|rdf|rss|rss2|atom)/?$] => index.php?p=$matches[1]&name=$matches[2]&feed=$matches[3]
			[id_([0-9]+)/([^/]+).html/(feed|rdf|rss|rss2|atom)/?$] => index.php?p=$matches[1]&name=$matches[2]&feed=$matches[3]
			[id_([0-9]+)/([^/]+).html/page/?([0-9]{1,})/?$] => index.php?p=$matches[1]&name=$matches[2]&paged=$matches[3]
			[id_([0-9]+)/([^/]+).html/comment-page-([0-9]{1,})/?$] => index.php?p=$matches[1]&name=$matches[2]&cpage=$matches[3]
			[id_([0-9]+)/([^/]+).html(?:/([0-9]+))?/?$] => index.php?p=$matches[1]&name=$matches[2]&page=$matches[3]
			[id_[0-9]+/[^/]+.html/([^/]+)/?$] => index.php?attachment=$matches[1]
			[id_[0-9]+/[^/]+.html/([^/]+)/trackback/?$] => index.php?attachment=$matches[1]&tb=1
			[id_[0-9]+/[^/]+.html/([^/]+)/feed/(feed|rdf|rss|rss2|atom)/?$] => index.php?attachment=$matches[1]&feed=$matches[2]
			[id_[0-9]+/[^/]+.html/([^/]+)/(feed|rdf|rss|rss2|atom)/?$] => index.php?attachment=$matches[1]&feed=$matches[2]
			[id_[0-9]+/[^/]+.html/([^/]+)/comment-page-([0-9]{1,})/?$] => index.php?attachment=$matches[1]&cpage=$matches[2]
			[id_[0-9]+/[^/]+.html/([^/]+)/embed/?$] => index.php?attachment=$matches[1]&embed=true
			[id_[0-9]+/attachment/([^/]+)/?$] => index.php?attachment=$matches[1]
			[id_[0-9]+/attachment/([^/]+)/trackback/?$] => index.php?attachment=$matches[1]&tb=1
			[id_[0-9]+/attachment/([^/]+)/feed/(feed|rdf|rss|rss2|atom)/?$] => index.php?attachment=$matches[1]&feed=$matches[2]
			[id_[0-9]+/attachment/([^/]+)/(feed|rdf|rss|rss2|atom)/?$] => index.php?attachment=$matches[1]&feed=$matches[2]
			[id_[0-9]+/attachment/([^/]+)/comment-page-([0-9]{1,})/?$] => index.php?attachment=$matches[1]&cpage=$matches[2]
			[id_[0-9]+/attachment/([^/]+)/embed/?$] => index.php?attachment=$matches[1]&embed=true
			[id_([0-9]+)/embed/?$] => index.php?p=$matches[1]&embed=true
			[id_([0-9]+)/trackback/?$] => index.php?p=$matches[1]&tb=1
			[id_([0-9]+)/feed/(feed|rdf|rss|rss2|atom)/?$] => index.php?p=$matches[1]&feed=$matches[2]
			[id_([0-9]+)/(feed|rdf|rss|rss2|atom)/?$] => index.php?p=$matches[1]&feed=$matches[2]
			[id_([0-9]+)/page/?([0-9]{1,})/?$] => index.php?p=$matches[1]&paged=$matches[2]
			[id_([0-9]+)/comment-page-([0-9]{1,})/?$] => index.php?p=$matches[1]&cpage=$matches[2]
			[id_([0-9]+)(?:/([0-9]+))?/?$] => index.php?p=$matches[1]&page=$matches[2]
			[id_[0-9]+/([^/]+)/?$] => index.php?attachment=$matches[1]
			[id_[0-9]+/([^/]+)/trackback/?$] => index.php?attachment=$matches[1]&tb=1
			[id_[0-9]+/([^/]+)/feed/(feed|rdf|rss|rss2|atom)/?$] => index.php?attachment=$matches[1]&feed=$matches[2]
			[id_[0-9]+/([^/]+)/(feed|rdf|rss|rss2|atom)/?$] => index.php?attachment=$matches[1]&feed=$matches[2]
			[id_[0-9]+/([^/]+)/comment-page-([0-9]{1,})/?$] => index.php?attachment=$matches[1]&cpage=$matches[2]
			[id_[0-9]+/([^/]+)/embed/?$] => index.php?attachment=$matches[1]&embed=true
			[.?.+?/attachment/([^/]+)/?$] => index.php?attachment=$matches[1]
			[.?.+?/attachment/([^/]+)/trackback/?$] => index.php?attachment=$matches[1]&tb=1
			[.?.+?/attachment/([^/]+)/feed/(feed|rdf|rss|rss2|atom)/?$] => index.php?attachment=$matches[1]&feed=$matches[2]
			[.?.+?/attachment/([^/]+)/(feed|rdf|rss|rss2|atom)/?$] => index.php?attachment=$matches[1]&feed=$matches[2]
			[.?.+?/attachment/([^/]+)/comment-page-([0-9]{1,})/?$] => index.php?attachment=$matches[1]&cpage=$matches[2]
			[.?.+?/attachment/([^/]+)/embed/?$] => index.php?attachment=$matches[1]&embed=true
			[(.?.+?)/embed/?$] => index.php?pagename=$matches[1]&embed=true
			[(.?.+?)/trackback/?$] => index.php?pagename=$matches[1]&tb=1
			[(.?.+?)/feed/(feed|rdf|rss|rss2|atom)/?$] => index.php?pagename=$matches[1]&feed=$matches[2]
			[(.?.+?)/(feed|rdf|rss|rss2|atom)/?$] => index.php?pagename=$matches[1]&feed=$matches[2]
			[(.?.+?)/page/?([0-9]{1,})/?$] => index.php?pagename=$matches[1]&paged=$matches[2]
			[(.?.+?)/comment-page-([0-9]{1,})/?$] => index.php?pagename=$matches[1]&cpage=$matches[2]
			[(.?.+?)(?:/([0-9]+))?/?$] => index.php?pagename=$matches[1]&page=$matches[2]
		)

	[extra_rules] => Array ()

	[extra_rules_top] => Array (
			[(filecode)(/.*)$] => index.php?pagename=$matches[1]&file_path=$matches[2]
		)

	[non_wp_rules] => Array ()

	[extra_permastructs] => Array (
			[category] => Array (
					[with_front] => 
					[ep_mask] => 512
					[paged] => 1
					[feed] => 1
					[forcomments] => 
					[walk_dirs] => 1
					[endpoints] => 1
					[struct] => cat/%category%
				)

			[post_tag] => Array (
					[with_front] => 
					[ep_mask] => 1024
					[paged] => 1
					[feed] => 1
					[forcomments] => 
					[walk_dirs] => 1
					[endpoints] => 1
					[struct] => met/%post_tag%
				)

			[article] => Array (
					[with_front] => 
					[ep_mask] => 1
					[paged] => 1
					[feed] => 1
					[forcomments] => 
					[walk_dirs] => 1
					[endpoints] => 1
					[struct] => article/%article%
				)
		)

	[endpoints] => Array ()

	[use_verbose_rules] => 
	[use_verbose_page_rules] => 
	[rewritecode] => Array
		(
			[0] => %year%
			[1] => %monthnum%
			[2] => %day%
			[3] => %hour%
			[4] => %minute%
			[5] => %second%
			[6] => %postname%
			[7] => %post_id%
			[8] => %author%
			[9] => %pagename%
			[10] => %search%
			[11] => %category%
			[12] => %post_tag%
			[13] => %post_format%
			[14] => %article%
		)

	[rewritereplace] => Array
		(
			[0] => ([0-9]{4})
			[1] => ([0-9]{1,2})
			[2] => ([0-9]{1,2})
			[3] => ([0-9]{1,2})
			[4] => ([0-9]{1,2})
			[5] => ([0-9]{1,2})
			[6] => ([^/]+)
			[7] => ([0-9]+)
			[8] => ([^/]+)
			[9] => ([^/]+?)
			[10] => (.+)
			[11] => (.+?)
			[12] => ([^/]+)
			[13] => ([^/]+)
			[14] => ([^/]+)
		)

	[queryreplace] => Array
		(
			[0] => year=
			[1] => monthnum=
			[2] => day=
			[3] => hour=
			[4] => minute=
			[5] => second=
			[6] => name=
			[7] => p=
			[8] => author_name=
			[9] => pagename=
			[10] => s=
			[11] => category_name=
			[12] => tag=
			[13] => post_format=
			[14] => article=
		)

	[feeds] => Array
		(
			[0] => feed
			[1] => rdf
			[2] => rss
			[3] => rss2
			[4] => atom
		)

)
меню

#2 ЧПУ для дополнительного параметра постоянной страницы

Пример перезаписи ЧПУ вида: http://mysite/project/1 в http://mysite/index.php?pagename=project&id=1:

add_filter('rewrite_rules_array', 'my_insert_rewrite_rules');
add_filter('query_vars', 'my_insert_query_vars');
add_action('wp_loaded', 'my_flush_rules');

// flush_rules() если нашего правила еще нет в правилах
function my_flush_rules(){
	$rules = get_option( 'rewrite_rules' );

	if ( ! isset( $rules['(project)/(\d*)$'] ) ) {
		global $wp_rewrite;
		$wp_rewrite->flush_rules();
	}
}

// Добавляем новое правило
function my_insert_rewrite_rules( $rules ){
	$newrules = array(
		'(project)/(\d*)$' => 'index.php?pagename=$matches[1]&id=$matches[2]'
	);
	return $newrules + $rules;
}

// Добавим переменную запроса id в переменные, чтобы WP знал о ней
function my_insert_query_vars( $vars ){
	array_push($vars, 'id');
	return $vars;
}

Имейте ввиду, что flush_rules() очень требовательная к ресурсам функция, поэтому нельзя запускать её каждый раз при генерации страницы. Лучше всего запускать её один раз при активации плагина через функцию register_activation_hook().

Также flush_rules() всегда можно запустить один раз, просто зайдя в настройки постоянных ссылок в админ-панели WordPress и сохранив настройки без внесения каких-либо изменений.

меню

#3 Пример редиректа со страницы http://example.com/feed.xml на http://example.com/feed/rss2

add_filter( 'generate_rewrite_rules', 'feed_dir_rewrite' );
function feed_dir_rewrite( $wp_rewrite ) {
	$feed_rules = array(
		'index.rdf' => 'index.php?feed=rdf',
		'index.xml' => 'index.php?feed=rss2',
		'(.+).xml'  => 'index.php?feed=' . $wp_rewrite->preg_index(1)
	);

	$wp_rewrite->rules = $feed_rules + $wp_rewrite->rules;
	return $wp_rewrite->rules;
}

Обратите внимание, что переменная передается по ссылке и передает весь класс WP_Rewrite, а не только на правила перезаписи rules.

Подключать такие правила нужно до того, как WordPress сделает что либо с правилами перезаписи. А это значит до хука init. Также имейте ввиду, что такое включение правил будет работать на всем сайте, как если бы вы добавили их в файл .htaccess.

меню

#4 Правила перезаписи не для WordPress а для .htaccess

$wp_rewrite->non_wp_rules = array( 'Pattern' => 'Substitution' );

print_r( $wp_rewrite->mod_rewrite_rules() );

/* Выведет:

RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteRule ^Pattern /Substitution [QSA,L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]

*/

#5 Добавим .html для постоянных страниц WordPress

add_action('init', 'html_page_permalink', -1);
function html_page_permalink(){
	global $wp_rewrite; // открываем доступ к глобальной переменной с классом WP_Rewrite

	// если еще нет '.html' в структуре страниц, добавляем
	if( ! strpos($wp_rewrite->get_page_permastruct(), '.html') ){
		$wp_rewrite->page_structure = $wp_rewrite->page_structure . '.html';
	}
}

// Удалим слэш на конце, если нужно. Если слэш есть в структуре ЧПУ, то он будет добавляться и к постоянным страницам.
add_filter('user_trailingslashit', 'no_page_slash', 70, 2);
function no_page_slash( $string, $type ){
   global $wp_rewrite;

	if( $type == 'page' && $wp_rewrite->using_permalinks() && $wp_rewrite->use_trailing_slashes )
		$string = untrailingslashit($string);

   return $string;
}

Чтобы код начал работать, нужно обновить (сбросить) настройки ЧПУ в админке!

меню

#6 Изменение префикса в URL (ЧПУ) автора (пользователя)

Обычно URL на страницу архива автора выглядит так: http://example.com/author/egorka/. Допустим нам нужно изменить префикс (slug) с author на creator:

add_action('init', function(){
	$GLOBALS['wp_rewrite']->author_base = 'creator';
}, 1);

Теперь еще, нужно сбросить настройки ЧПУ в админке, для этого просто зайдите на страницу настроек «Постоянные ссылки»!

#7 ЧПУ для типа записи: тип_записи/slug

Допустим, при регистрации типа записи с помощью register_post_type() в параметре rewrite мы указали false, значит теперь правила перезаписи для типа записи не создаются вообще и их нужно создать вручную.

Делается это так:

add_action('init', function(){
	global $wp_rewrite;

	// добавим тег перезаписи, чтобы add_permastruct() его поняла
	// он потом будет заменен на часть регулярки указанной во втором параметре
	$wp_rewrite->add_rewrite_tag( '%book%', '([^/]+)', "post_type=book&name=" );

	$permastruct = 'book/%book%'; // наша структура ЧПУ

	// добавляем структуру ЧПУ
	$wp_rewrite->add_permastruct( 'book', $permastruct, array(
		'with_front'  => true,
		'paged'       => true,
		'feed'        => false,
		'forcomments' => false,
		'walk_dirs'   => false,
		'endpoints'   => false,
	) );

}, 1);

// третий параметр в add_permastruct() можно не указывать, тогда аргументы будут по умолчанию

И нужно обновить (сбросить) настройки ЧПУ в админке!

Про аргументы $args читайте в описании функции add_permastruct().

меню

#8 ЧПУ для типа записи: тип_записи/ID

Допустим, при регистрации типа записи orders с помощью register_post_type() параметр rewrite = false - правила перезаписи не создаются и их нужно создать вручную.

URL должен выглядеть как site.ru/orders/123, где 123 - ID записи.

add_action('init', function(){

	// создам правила ЧПУ
	add_rewrite_tag( '%order_id%', '([0-9]+)', "post_type=orders&p=" );
	// или можно так
	// создам правила ЧПУ - тут 'order/([0-9]+)/?$' полностью совпадает с тем что создало бы add_permastruct() и поэтому заменяет...
//  add_filter( 'orders'.'_rewrite_rules', function( $rules ){
//      return array( 'order/([0-9]+)/?$' => 'index.php?post_type=orders&p=$matches[2]' );
//  } );

	// регистрируем структуру для типа записи
	add_permastruct( 'orders', 'order/%order_id%', array(
		'with_front'  => false,
		'paged'       => false,
		'feed'        => false,
		'forcomments' => false,
		'walk_dirs'   => false,
		'endpoints'   => false,
	));

	// заменим тег в URL на ID
	add_filter('post_type_link', 'orders_permalink', 1, 2);
	function orders_permalink( $permalink, $post ){
		if( false === strpos($permalink, '%order_id%') ) return $permalink;

		return str_replace( '%order_id%', $post->ID, $permalink );
	}

}
меню

#9 Удаление названия типа записи (префикса) из URL

Вариант 1

Допустим у нас есть новый тип записи team, который имеет ЧПУ вида: site.ru/team/nazvanie-zapisi. Мы хотим удалить префикс team и сделать ссылки этого типа записи такого вида: site.ru/nazvanie-zapisi.

add_filter( 'post_type_link', 'remove_post_type_slug', 10, 2 );
add_action( 'pre_get_posts', 'add_post_type_to_get_posts_request' );

// Удаляем префикс с именем типа записи из URL
function remove_post_type_slug( $post_link, $post ){
	if( $post->post_type === 'team' ){
		return str_replace("/$post->post_type/", '/', $post_link );
	}

	return $post_link;
}

// Добавляем тип записи в запрос
function add_post_type_to_get_posts_request( $query ){
	if( is_admin() || ! $query->is_main_query() ) return; // не основной запрос

	// не запрос с name параметром (как у постоянной страницы)
	if( ! isset($query->query['page']) || empty($query->query['name']) || count($query->query) != 2 )
		return;

	$query->set('post_type', array('post', 'page', 'team') ); // 'team' added
}

Тут надо иметь ввиду, что наш новый URL вида site.ru/nazvanie-zapisi по структуре точно такой же как URL постоянных страниц (и возможно как ЧПУ постов). И если название постоянной страницы и записи нового типа будут совпадать, то мы получим конфликт и вероятно будет показана неправильная запись. Но так как такая ситуация очень мало вероятна, мы этот возможный баг просто имеем ввиду и никак не обрабатываем...

Вариант 2

В этом варианте тип записи называется pool_services и тут мы не используем хук post_type_link, а используем метод add_permastruct() - это позволяет убрать название типа записи из URL не только на фронте, но и в админке.

В результате получим URL вида /postname а не /pool-services/postname.

add_action( 'init', 'pw24_post_type_rewrite');
function pw24_post_type_rewrite() {
	global $wp_rewrite;
	// в данном случае тип записи - pool_services
	$wp_rewrite->add_rewrite_tag("%pool_services%", '([^/]+)', "pool_services=");
	$wp_rewrite->add_permastruct('pool_services', '%pool_services%' );
}

add_action( 'pre_get_posts', 'pw24_add_post_type_to_get_posts_request' );
function pw24_add_post_type_to_get_posts_request( $query ){
	if( is_admin() || ! $query->is_main_query() ) return; // не основной запрос

	// не запрос с name параметром (как у постоянной страницы)
	if( ! isset($query->query['page']) || empty($query->query['name']) || count($query->query) != 2 )
		return;

	$query->set('post_type', array('post', 'page', 'pool_services') ); // добавляем 'pool_services'
}

И всё! Задача решена - теперь в ссылках и в админке и на сайте отсутствует название типа записи 'pool-services' и все страницы работают без проблем.

Список изменений

С версии 1.5.0 Введена.

Код WP_Rewrite{} WP 5.5.1

wp-includes/class-wp-rewrite.php
<?php
class WP_Rewrite {
	/**
	 * Permalink structure for posts.
	 *
	 * @since 1.5.0
	 * @var string
	 */
	public $permalink_structure;

	/**
	 * Whether to add trailing slashes.
	 *
	 * @since 2.2.0
	 * @var bool
	 */
	public $use_trailing_slashes;

	/**
	 * Base for the author permalink structure (example.com/$author_base/authorname).
	 *
	 * @since 1.5.0
	 * @var string
	 */
	var $author_base = 'author';

	/**
	 * Permalink structure for author archives.
	 *
	 * @since 1.5.0
	 * @var string
	 */
	var $author_structure;

	/**
	 * Permalink structure for date archives.
	 *
	 * @since 1.5.0
	 * @var string
	 */
	var $date_structure;

	/**
	 * Permalink structure for pages.
	 *
	 * @since 1.5.0
	 * @var string
	 */
	var $page_structure;

	/**
	 * Base of the search permalink structure (example.com/$search_base/query).
	 *
	 * @since 1.5.0
	 * @var string
	 */
	var $search_base = 'search';

	/**
	 * Permalink structure for searches.
	 *
	 * @since 1.5.0
	 * @var string
	 */
	var $search_structure;

	/**
	 * Comments permalink base.
	 *
	 * @since 1.5.0
	 * @var string
	 */
	var $comments_base = 'comments';

	/**
	 * Pagination permalink base.
	 *
	 * @since 3.1.0
	 * @var string
	 */
	public $pagination_base = 'page';

	/**
	 * Comments pagination permalink base.
	 *
	 * @since 4.2.0
	 * @var string
	 */
	var $comments_pagination_base = 'comment-page';

	/**
	 * Feed permalink base.
	 *
	 * @since 1.5.0
	 * @var string
	 */
	var $feed_base = 'feed';

	/**
	 * Comments feed permalink structure.
	 *
	 * @since 1.5.0
	 * @var string
	 */
	var $comment_feed_structure;

	/**
	 * Feed request permalink structure.
	 *
	 * @since 1.5.0
	 * @var string
	 */
	var $feed_structure;

	/**
	 * The static portion of the post permalink structure.
	 *
	 * If the permalink structure is "/archive/%post_id%" then the front
	 * is "/archive/". If the permalink structure is "/%year%/%postname%/"
	 * then the front is "/".
	 *
	 * @since 1.5.0
	 * @var string
	 *
	 * @see WP_Rewrite::init()
	 */
	public $front;

	/**
	 * The prefix for all permalink structures.
	 *
	 * If PATHINFO/index permalinks are in use then the root is the value of
	 * `WP_Rewrite::$index` with a trailing slash appended. Otherwise the root
	 * will be empty.
	 *
	 * @since 1.5.0
	 * @var string
	 *
	 * @see WP_Rewrite::init()
	 * @see WP_Rewrite::using_index_permalinks()
	 */
	public $root = '';

	/**
	 * The name of the index file which is the entry point to all requests.
	 *
	 * @since 1.5.0
	 * @var string
	 */
	public $index = 'index.php';

	/**
	 * Variable name to use for regex matches in the rewritten query.
	 *
	 * @since 1.5.0
	 * @var string
	 */
	var $matches = '';

	/**
	 * Rewrite rules to match against the request to find the redirect or query.
	 *
	 * @since 1.5.0
	 * @var array
	 */
	var $rules;

	/**
	 * Additional rules added external to the rewrite class.
	 *
	 * Those not generated by the class, see add_rewrite_rule().
	 *
	 * @since 2.1.0
	 * @var array
	 */
	var $extra_rules = array();

	/**
	 * Additional rules that belong at the beginning to match first.
	 *
	 * Those not generated by the class, see add_rewrite_rule().
	 *
	 * @since 2.3.0
	 * @var array
	 */
	var $extra_rules_top = array();

	/**
	 * Rules that don't redirect to WordPress' index.php.
	 *
	 * These rules are written to the mod_rewrite portion of the .htaccess,
	 * and are added by add_external_rule().
	 *
	 * @since 2.1.0
	 * @var array
	 */
	var $non_wp_rules = array();

	/**
	 * Extra permalink structures, e.g. categories, added by add_permastruct().
	 *
	 * @since 2.1.0
	 * @var array
	 */
	var $extra_permastructs = array();

	/**
	 * Endpoints (like /trackback/) added by add_rewrite_endpoint().
	 *
	 * @since 2.1.0
	 * @var array
	 */
	var $endpoints;

	/**
	 * Whether to write every mod_rewrite rule for WordPress into the .htaccess file.
	 *
	 * This is off by default, turning it on might print a lot of rewrite rules
	 * to the .htaccess file.
	 *
	 * @since 2.0.0
	 * @var bool
	 *
	 * @see WP_Rewrite::mod_rewrite_rules()
	 */
	public $use_verbose_rules = false;

	/**
	 * Could post permalinks be confused with those of pages?
	 *
	 * If the first rewrite tag in the post permalink structure is one that could
	 * also match a page name (e.g. %postname% or %author%) then this flag is
	 * set to true. Prior to WordPress 3.3 this flag indicated that every page
	 * would have a set of rules added to the top of the rewrite rules array.
	 * Now it tells WP::parse_request() to check if a URL matching the page
	 * permastruct is actually a page before accepting it.
	 *
	 * @since 2.5.0
	 * @var bool
	 *
	 * @see WP_Rewrite::init()
	 */
	public $use_verbose_page_rules = true;

	/**
	 * Rewrite tags that can be used in permalink structures.
	 *
	 * These are translated into the regular expressions stored in
	 * `WP_Rewrite::$rewritereplace` and are rewritten to the query
	 * variables listed in WP_Rewrite::$queryreplace.
	 *
	 * Additional tags can be added with add_rewrite_tag().
	 *
	 * @since 1.5.0
	 * @var array
	 */
	var $rewritecode = array(
		'%year%',
		'%monthnum%',
		'%day%',
		'%hour%',
		'%minute%',
		'%second%',
		'%postname%',
		'%post_id%',
		'%author%',
		'%pagename%',
		'%search%',
	);

	/**
	 * Regular expressions to be substituted into rewrite rules in place
	 * of rewrite tags, see WP_Rewrite::$rewritecode.
	 *
	 * @since 1.5.0
	 * @var array
	 */
	var $rewritereplace = array(
		'([0-9]{4})',
		'([0-9]{1,2})',
		'([0-9]{1,2})',
		'([0-9]{1,2})',
		'([0-9]{1,2})',
		'([0-9]{1,2})',
		'([^/]+)',
		'([0-9]+)',
		'([^/]+)',
		'([^/]+?)',
		'(.+)',
	);

	/**
	 * Query variables that rewrite tags map to, see WP_Rewrite::$rewritecode.
	 *
	 * @since 1.5.0
	 * @var array
	 */
	var $queryreplace = array(
		'year=',
		'monthnum=',
		'day=',
		'hour=',
		'minute=',
		'second=',
		'name=',
		'p=',
		'author_name=',
		'pagename=',
		's=',
	);

	/**
	 * Supported default feeds.
	 *
	 * @since 1.5.0
	 * @var array
	 */
	public $feeds = array( 'feed', 'rdf', 'rss', 'rss2', 'atom' );

	/**
	 * Determines whether permalinks are being used.
	 *
	 * This can be either rewrite module or permalink in the HTTP query string.
	 *
	 * @since 1.5.0
	 *
	 * @return bool True, if permalinks are enabled.
	 */
	public function using_permalinks() {
		return ! empty( $this->permalink_structure );
	}

	/**
	 * Determines whether permalinks are being used and rewrite module is not enabled.
	 *
	 * Means that permalink links are enabled and index.php is in the URL.
	 *
	 * @since 1.5.0
	 *
	 * @return bool Whether permalink links are enabled and index.php is in the URL.
	 */
	public function using_index_permalinks() {
		if ( empty( $this->permalink_structure ) ) {
			return false;
		}

		// If the index is not in the permalink, we're using mod_rewrite.
		return preg_match( '#^/*' . $this->index . '#', $this->permalink_structure );
	}

	/**
	 * Determines whether permalinks are being used and rewrite module is enabled.
	 *
	 * Using permalinks and index.php is not in the URL.
	 *
	 * @since 1.5.0
	 *
	 * @return bool Whether permalink links are enabled and index.php is NOT in the URL.
	 */
	public function using_mod_rewrite_permalinks() {
		return $this->using_permalinks() && ! $this->using_index_permalinks();
	}

	/**
	 * Indexes for matches for usage in preg_*() functions.
	 *
	 * The format of the string is, with empty matches property value, '$NUM'.
	 * The 'NUM' will be replaced with the value in the $number parameter. With
	 * the matches property not empty, the value of the returned string will
	 * contain that value of the matches property. The format then will be
	 * '$MATCHES[NUM]', with MATCHES as the value in the property and NUM the
	 * value of the $number parameter.
	 *
	 * @since 1.5.0
	 *
	 * @param int $number Index number.
	 * @return string
	 */
	public function preg_index( $number ) {
		$match_prefix = '$';
		$match_suffix = '';

		if ( ! empty( $this->matches ) ) {
			$match_prefix = '$' . $this->matches . '[';
			$match_suffix = ']';
		}

		return "$match_prefix$number$match_suffix";
	}

	/**
	 * Retrieves all page and attachments for pages URIs.
	 *
	 * The attachments are for those that have pages as parents and will be
	 * retrieved.
	 *
	 * @since 2.5.0
	 *
	 * @global wpdb $wpdb WordPress database abstraction object.
	 *
	 * @return array Array of page URIs as first element and attachment URIs as second element.
	 */
	public function page_uri_index() {
		global $wpdb;

		// Get pages in order of hierarchy, i.e. children after parents.
		$pages = $wpdb->get_results( "SELECT ID, post_name, post_parent FROM $wpdb->posts WHERE post_type = 'page' AND post_status != 'auto-draft'" );
		$posts = get_page_hierarchy( $pages );

		// If we have no pages get out quick.
		if ( ! $posts ) {
			return array( array(), array() );
		}

		// Now reverse it, because we need parents after children for rewrite rules to work properly.
		$posts = array_reverse( $posts, true );

		$page_uris            = array();
		$page_attachment_uris = array();

		foreach ( $posts as $id => $post ) {
			// URL => page name.
			$uri         = get_page_uri( $id );
			$attachments = $wpdb->get_results( $wpdb->prepare( "SELECT ID, post_name, post_parent FROM $wpdb->posts WHERE post_type = 'attachment' AND post_parent = %d", $id ) );
			if ( ! empty( $attachments ) ) {
				foreach ( $attachments as $attachment ) {
					$attach_uri                          = get_page_uri( $attachment->ID );
					$page_attachment_uris[ $attach_uri ] = $attachment->ID;
				}
			}

			$page_uris[ $uri ] = $id;
		}

		return array( $page_uris, $page_attachment_uris );
	}

	/**
	 * Retrieves all of the rewrite rules for pages.
	 *
	 * @since 1.5.0
	 *
	 * @return string[] Page rewrite rules.
	 */
	public function page_rewrite_rules() {
		// The extra .? at the beginning prevents clashes with other regular expressions in the rules array.
		$this->add_rewrite_tag( '%pagename%', '(.?.+?)', 'pagename=' );

		return $this->generate_rewrite_rules( $this->get_page_permastruct(), EP_PAGES, true, true, false, false );
	}

	/**
	 * Retrieves date permalink structure, with year, month, and day.
	 *
	 * The permalink structure for the date, if not set already depends on the
	 * permalink structure. It can be one of three formats. The first is year,
	 * month, day; the second is day, month, year; and the last format is month,
	 * day, year. These are matched against the permalink structure for which
	 * one is used. If none matches, then the default will be used, which is
	 * year, month, day.
	 *
	 * Prevents post ID and date permalinks from overlapping. In the case of
	 * post_id, the date permalink will be prepended with front permalink with
	 * 'date/' before the actual permalink to form the complete date permalink
	 * structure.
	 *
	 * @since 1.5.0
	 *
	 * @return string|false Date permalink structure on success, false on failure.
	 */
	public function get_date_permastruct() {
		if ( isset( $this->date_structure ) ) {
			return $this->date_structure;
		}

		if ( empty( $this->permalink_structure ) ) {
			$this->date_structure = '';
			return false;
		}

		// The date permalink must have year, month, and day separated by slashes.
		$endians = array( '%year%/%monthnum%/%day%', '%day%/%monthnum%/%year%', '%monthnum%/%day%/%year%' );

		$this->date_structure = '';
		$date_endian          = '';

		foreach ( $endians as $endian ) {
			if ( false !== strpos( $this->permalink_structure, $endian ) ) {
				$date_endian = $endian;
				break;
			}
		}

		if ( empty( $date_endian ) ) {
			$date_endian = '%year%/%monthnum%/%day%';
		}

		/*
		 * Do not allow the date tags and %post_id% to overlap in the permalink
		 * structure. If they do, move the date tags to $front/date/.
		 */
		$front = $this->front;
		preg_match_all( '/%.+?%/', $this->permalink_structure, $tokens );
		$tok_index = 1;
		foreach ( (array) $tokens[0] as $token ) {
			if ( '%post_id%' === $token && ( $tok_index <= 3 ) ) {
				$front = $front . 'date/';
				break;
			}
			$tok_index++;
		}

		$this->date_structure = $front . $date_endian;

		return $this->date_structure;
	}

	/**
	 * Retrieves the year permalink structure without month and day.
	 *
	 * Gets the date permalink structure and strips out the month and day
	 * permalink structures.
	 *
	 * @since 1.5.0
	 *
	 * @return string|false Year permalink structure on success, false on failure.
	 */
	public function get_year_permastruct() {
		$structure = $this->get_date_permastruct();

		if ( empty( $structure ) ) {
			return false;
		}

		$structure = str_replace( '%monthnum%', '', $structure );
		$structure = str_replace( '%day%', '', $structure );
		$structure = preg_replace( '#/+#', '/', $structure );

		return $structure;
	}

	/**
	 * Retrieves the month permalink structure without day and with year.
	 *
	 * Gets the date permalink structure and strips out the day permalink
	 * structures. Keeps the year permalink structure.
	 *
	 * @since 1.5.0
	 *
	 * @return string|false Year/Month permalink structure on success, false on failure.
	 */
	public function get_month_permastruct() {
		$structure = $this->get_date_permastruct();

		if ( empty( $structure ) ) {
			return false;
		}

		$structure = str_replace( '%day%', '', $structure );
		$structure = preg_replace( '#/+#', '/', $structure );

		return $structure;
	}

	/**
	 * Retrieves the day permalink structure with month and year.
	 *
	 * Keeps date permalink structure with all year, month, and day.
	 *
	 * @since 1.5.0
	 *
	 * @return string|false Year/Month/Day permalink structure on success, false on failure.
	 */
	public function get_day_permastruct() {
		return $this->get_date_permastruct();
	}

	/**
	 * Retrieves the permalink structure for categories.
	 *
	 * If the category_base property has no value, then the category structure
	 * will have the front property value, followed by 'category', and finally
	 * '%category%'. If it does, then the root property will be used, along with
	 * the category_base property value.
	 *
	 * @since 1.5.0
	 *
	 * @return string|false Category permalink structure on success, false on failure.
	 */
	public function get_category_permastruct() {
		return $this->get_extra_permastruct( 'category' );
	}

	/**
	 * Retrieve the permalink structure for tags.
	 *
	 * If the tag_base property has no value, then the tag structure will have
	 * the front property value, followed by 'tag', and finally '%tag%'. If it
	 * does, then the root property will be used, along with the tag_base
	 * property value.
	 *
	 * @since 2.3.0
	 *
	 * @return string|false Tag permalink structure on success, false on failure.
	 */
	public function get_tag_permastruct() {
		return $this->get_extra_permastruct( 'post_tag' );
	}

	/**
	 * Retrieves an extra permalink structure by name.
	 *
	 * @since 2.5.0
	 *
	 * @param string $name Permalink structure name.
	 * @return string|false Permalink structure string on success, false on failure.
	 */
	public function get_extra_permastruct( $name ) {
		if ( empty( $this->permalink_structure ) ) {
			return false;
		}

		if ( isset( $this->extra_permastructs[ $name ] ) ) {
			return $this->extra_permastructs[ $name ]['struct'];
		}

		return false;
	}

	/**
	 * Retrieves the author permalink structure.
	 *
	 * The permalink structure is front property, author base, and finally
	 * '/%author%'. Will set the author_structure property and then return it
	 * without attempting to set the value again.
	 *
	 * @since 1.5.0
	 *
	 * @return string|false Author permalink structure on success, false on failure.
	 */
	public function get_author_permastruct() {
		if ( isset( $this->author_structure ) ) {
			return $this->author_structure;
		}

		if ( empty( $this->permalink_structure ) ) {
			$this->author_structure = '';
			return false;
		}

		$this->author_structure = $this->front . $this->author_base . '/%author%';

		return $this->author_structure;
	}

	/**
	 * Retrieves the search permalink structure.
	 *
	 * The permalink structure is root property, search base, and finally
	 * '/%search%'. Will set the search_structure property and then return it
	 * without attempting to set the value again.
	 *
	 * @since 1.5.0
	 *
	 * @return string|false Search permalink structure on success, false on failure.
	 */
	public function get_search_permastruct() {
		if ( isset( $this->search_structure ) ) {
			return $this->search_structure;
		}

		if ( empty( $this->permalink_structure ) ) {
			$this->search_structure = '';
			return false;
		}

		$this->search_structure = $this->root . $this->search_base . '/%search%';

		return $this->search_structure;
	}

	/**
	 * Retrieves the page permalink structure.
	 *
	 * The permalink structure is root property, and '%pagename%'. Will set the
	 * page_structure property and then return it without attempting to set the
	 * value again.
	 *
	 * @since 1.5.0
	 *
	 * @return string|false Page permalink structure on success, false on failure.
	 */
	public function get_page_permastruct() {
		if ( isset( $this->page_structure ) ) {
			return $this->page_structure;
		}

		if ( empty( $this->permalink_structure ) ) {
			$this->page_structure = '';
			return false;
		}

		$this->page_structure = $this->root . '%pagename%';

		return $this->page_structure;
	}

	/**
	 * Retrieves the feed permalink structure.
	 *
	 * The permalink structure is root property, feed base, and finally
	 * '/%feed%'. Will set the feed_structure property and then return it
	 * without attempting to set the value again.
	 *
	 * @since 1.5.0
	 *
	 * @return string|false Feed permalink structure on success, false on failure.
	 */
	public function get_feed_permastruct() {
		if ( isset( $this->feed_structure ) ) {
			return $this->feed_structure;
		}

		if ( empty( $this->permalink_structure ) ) {
			$this->feed_structure = '';
			return false;
		}

		$this->feed_structure = $this->root . $this->feed_base . '/%feed%';

		return $this->feed_structure;
	}

	/**
	 * Retrieves the comment feed permalink structure.
	 *
	 * The permalink structure is root property, comment base property, feed
	 * base and finally '/%feed%'. Will set the comment_feed_structure property
	 * and then return it without attempting to set the value again.
	 *
	 * @since 1.5.0
	 *
	 * @return string|false Comment feed permalink structure on success, false on failure.
	 */
	public function get_comment_feed_permastruct() {
		if ( isset( $this->comment_feed_structure ) ) {
			return $this->comment_feed_structure;
		}

		if ( empty( $this->permalink_structure ) ) {
			$this->comment_feed_structure = '';
			return false;
		}

		$this->comment_feed_structure = $this->root . $this->comments_base . '/' . $this->feed_base . '/%feed%';

		return $this->comment_feed_structure;
	}

	/**
	 * Adds or updates existing rewrite tags (e.g. %postname%).
	 *
	 * If the tag already exists, replace the existing pattern and query for
	 * that tag, otherwise add the new tag.
	 *
	 * @since 1.5.0
	 *
	 * @see WP_Rewrite::$rewritecode
	 * @see WP_Rewrite::$rewritereplace
	 * @see WP_Rewrite::$queryreplace
	 *
	 * @param string $tag   Name of the rewrite tag to add or update.
	 * @param string $regex Regular expression to substitute the tag for in rewrite rules.
	 * @param string $query String to append to the rewritten query. Must end in '='.
	 */
	public function add_rewrite_tag( $tag, $regex, $query ) {
		$position = array_search( $tag, $this->rewritecode, true );
		if ( false !== $position && null !== $position ) {
			$this->rewritereplace[ $position ] = $regex;
			$this->queryreplace[ $position ]   = $query;
		} else {
			$this->rewritecode[]    = $tag;
			$this->rewritereplace[] = $regex;
			$this->queryreplace[]   = $query;
		}
	}


	/**
	 * Removes an existing rewrite tag.
	 *
	 * @since 4.5.0
	 *
	 * @see WP_Rewrite::$rewritecode
	 * @see WP_Rewrite::$rewritereplace
	 * @see WP_Rewrite::$queryreplace
	 *
	 * @param string $tag Name of the rewrite tag to remove.
	 */
	public function remove_rewrite_tag( $tag ) {
		$position = array_search( $tag, $this->rewritecode, true );
		if ( false !== $position && null !== $position ) {
			unset( $this->rewritecode[ $position ] );
			unset( $this->rewritereplace[ $position ] );
			unset( $this->queryreplace[ $position ] );
		}
	}

	/**
	 * Generates rewrite rules from a permalink structure.
	 *
	 * The main WP_Rewrite function for building the rewrite rule list. The
	 * contents of the function is a mix of black magic and regular expressions,
	 * so best just ignore the contents and move to the parameters.
	 *
	 * @since 1.5.0
	 *
	 * @param string $permalink_structure The permalink structure.
	 * @param int    $ep_mask             Optional. Endpoint mask defining what endpoints are added to the structure.
	 *                                    Accepts `EP_NONE`, `EP_PERMALINK`, `EP_ATTACHMENT`, `EP_DATE`, `EP_YEAR`,
	 *                                    `EP_MONTH`, `EP_DAY`, `EP_ROOT`, `EP_COMMENTS`, `EP_SEARCH`, `EP_CATEGORIES`,
	 *                                    `EP_TAGS`, `EP_AUTHORS`, `EP_PAGES`, `EP_ALL_ARCHIVES`, and `EP_ALL`.
	 *                                    Default `EP_NONE`.
	 * @param bool   $paged               Optional. Whether archive pagination rules should be added for the structure.
	 *                                    Default true.
	 * @param bool   $feed                Optional Whether feed rewrite rules should be added for the structure.
	 *                                    Default true.
	 * @param bool   $forcomments         Optional. Whether the feed rules should be a query for a comments feed.
	 *                                    Default false.
	 * @param bool   $walk_dirs           Optional. Whether the 'directories' making up the structure should be walked
	 *                                    over and rewrite rules built for each in-turn. Default true.
	 * @param bool   $endpoints           Optional. Whether endpoints should be applied to the generated rewrite rules.
	 *                                    Default true.
	 * @return string[] Array of rewrite rules keyed by their regex pattern.
	 */
	public function generate_rewrite_rules( $permalink_structure, $ep_mask = EP_NONE, $paged = true, $feed = true, $forcomments = false, $walk_dirs = true, $endpoints = true ) {
		// Build a regex to match the feed section of URLs, something like (feed|atom|rss|rss2)/?
		$feedregex2 = '';
		foreach ( (array) $this->feeds as $feed_name ) {
			$feedregex2 .= $feed_name . '|';
		}
		$feedregex2 = '(' . trim( $feedregex2, '|' ) . ')/?$';

		/*
		 * $feedregex is identical but with /feed/ added on as well, so URLs like <permalink>/feed/atom
		 * and <permalink>/atom are both possible
		 */
		$feedregex = $this->feed_base . '/' . $feedregex2;

		// Build a regex to match the trackback and page/xx parts of URLs.
		$trackbackregex = 'trackback/?$';
		$pageregex      = $this->pagination_base . '/?([0-9]{1,})/?$';
		$commentregex   = $this->comments_pagination_base . '-([0-9]{1,})/?$';
		$embedregex     = 'embed/?$';

		// Build up an array of endpoint regexes to append => queries to append.
		if ( $endpoints ) {
			$ep_query_append = array();
			foreach ( (array) $this->endpoints as $endpoint ) {
				// Match everything after the endpoint name, but allow for nothing to appear there.
				$epmatch = $endpoint[1] . '(/(.*))?/?$';

				// This will be appended on to the rest of the query for each dir.
				$epquery                     = '&' . $endpoint[2] . '=';
				$ep_query_append[ $epmatch ] = array( $endpoint[0], $epquery );
			}
		}

		// Get everything up to the first rewrite tag.
		$front = substr( $permalink_structure, 0, strpos( $permalink_structure, '%' ) );

		// Build an array of the tags (note that said array ends up being in $tokens[0]).
		preg_match_all( '/%.+?%/', $permalink_structure, $tokens );

		$num_tokens = count( $tokens[0] );

		$index          = $this->index; // Probably 'index.php'.
		$feedindex      = $index;
		$trackbackindex = $index;
		$embedindex     = $index;

		/*
		 * Build a list from the rewritecode and queryreplace arrays, that will look something
		 * like tagname=$matches[i] where i is the current $i.
		 */
		$queries = array();
		for ( $i = 0; $i < $num_tokens; ++$i ) {
			if ( 0 < $i ) {
				$queries[ $i ] = $queries[ $i - 1 ] . '&';
			} else {
				$queries[ $i ] = '';
			}

			$query_token    = str_replace( $this->rewritecode, $this->queryreplace, $tokens[0][ $i ] ) . $this->preg_index( $i + 1 );
			$queries[ $i ] .= $query_token;
		}

		// Get the structure, minus any cruft (stuff that isn't tags) at the front.
		$structure = $permalink_structure;
		if ( '/' !== $front ) {
			$structure = str_replace( $front, '', $structure );
		}

		/*
		 * Create a list of dirs to walk over, making rewrite rules for each level
		 * so for example, a $structure of /%year%/%monthnum%/%postname% would create
		 * rewrite rules for /%year%/, /%year%/%monthnum%/ and /%year%/%monthnum%/%postname%
		 */
		$structure = trim( $structure, '/' );
		$dirs      = $walk_dirs ? explode( '/', $structure ) : array( $structure );
		$num_dirs  = count( $dirs );

		// Strip slashes from the front of $front.
		$front = preg_replace( '|^/+|', '', $front );

		// The main workhorse loop.
		$post_rewrite = array();
		$struct       = $front;
		for ( $j = 0; $j < $num_dirs; ++$j ) {
			// Get the struct for this dir, and trim slashes off the front.
			$struct .= $dirs[ $j ] . '/'; // Accumulate. see comment near explode('/', $structure) above.
			$struct  = ltrim( $struct, '/' );

			// Replace tags with regexes.
			$match = str_replace( $this->rewritecode, $this->rewritereplace, $struct );

			// Make a list of tags, and store how many there are in $num_toks.
			$num_toks = preg_match_all( '/%.+?%/', $struct, $toks );

			// Get the 'tagname=$matches[i]'.
			$query = ( ! empty( $num_toks ) && isset( $queries[ $num_toks - 1 ] ) ) ? $queries[ $num_toks - 1 ] : '';

			// Set up $ep_mask_specific which is used to match more specific URL types.
			switch ( $dirs[ $j ] ) {
				case '%year%':
					$ep_mask_specific = EP_YEAR;
					break;
				case '%monthnum%':
					$ep_mask_specific = EP_MONTH;
					break;
				case '%day%':
					$ep_mask_specific = EP_DAY;
					break;
				default:
					$ep_mask_specific = EP_NONE;
			}

			// Create query for /page/xx.
			$pagematch = $match . $pageregex;
			$pagequery = $index . '?' . $query . '&paged=' . $this->preg_index( $num_toks + 1 );

			// Create query for /comment-page-xx.
			$commentmatch = $match . $commentregex;
			$commentquery = $index . '?' . $query . '&cpage=' . $this->preg_index( $num_toks + 1 );

			if ( get_option( 'page_on_front' ) ) {
				// Create query for Root /comment-page-xx.
				$rootcommentmatch = $match . $commentregex;
				$rootcommentquery = $index . '?' . $query . '&page_id=' . get_option( 'page_on_front' ) . '&cpage=' . $this->preg_index( $num_toks + 1 );
			}

			// Create query for /feed/(feed|atom|rss|rss2|rdf).
			$feedmatch = $match . $feedregex;
			$feedquery = $feedindex . '?' . $query . '&feed=' . $this->preg_index( $num_toks + 1 );

			// Create query for /(feed|atom|rss|rss2|rdf) (see comment near creation of $feedregex).
			$feedmatch2 = $match . $feedregex2;
			$feedquery2 = $feedindex . '?' . $query . '&feed=' . $this->preg_index( $num_toks + 1 );

			// Create query and regex for embeds.
			$embedmatch = $match . $embedregex;
			$embedquery = $embedindex . '?' . $query . '&embed=true';

			// If asked to, turn the feed queries into comment feed ones.
			if ( $forcomments ) {
				$feedquery  .= '&withcomments=1';
				$feedquery2 .= '&withcomments=1';
			}

			// Start creating the array of rewrites for this dir.
			$rewrite = array();

			// ...adding on /feed/ regexes => queries.
			if ( $feed ) {
				$rewrite = array(
					$feedmatch  => $feedquery,
					$feedmatch2 => $feedquery2,
					$embedmatch => $embedquery,
				);
			}

			// ...and /page/xx ones.
			if ( $paged ) {
				$rewrite = array_merge( $rewrite, array( $pagematch => $pagequery ) );
			}

			// Only on pages with comments add ../comment-page-xx/.
			if ( EP_PAGES & $ep_mask || EP_PERMALINK & $ep_mask ) {
				$rewrite = array_merge( $rewrite, array( $commentmatch => $commentquery ) );
			} elseif ( EP_ROOT & $ep_mask && get_option( 'page_on_front' ) ) {
				$rewrite = array_merge( $rewrite, array( $rootcommentmatch => $rootcommentquery ) );
			}

			// Do endpoints.
			if ( $endpoints ) {
				foreach ( (array) $ep_query_append as $regex => $ep ) {
					// Add the endpoints on if the mask fits.
					if ( $ep[0] & $ep_mask || $ep[0] & $ep_mask_specific ) {
						$rewrite[ $match . $regex ] = $index . '?' . $query . $ep[1] . $this->preg_index( $num_toks + 2 );
					}
				}
			}

			// If we've got some tags in this dir.
			if ( $num_toks ) {
				$post = false;
				$page = false;

				/*
				 * Check to see if this dir is permalink-level: i.e. the structure specifies an
				 * individual post. Do this by checking it contains at least one of 1) post name,
				 * 2) post ID, 3) page name, 4) timestamp (year, month, day, hour, second and
				 * minute all present). Set these flags now as we need them for the endpoints.
				 */
				if ( strpos( $struct, '%postname%' ) !== false
						|| strpos( $struct, '%post_id%' ) !== false
						|| strpos( $struct, '%pagename%' ) !== false
						|| ( strpos( $struct, '%year%' ) !== false && strpos( $struct, '%monthnum%' ) !== false && strpos( $struct, '%day%' ) !== false && strpos( $struct, '%hour%' ) !== false && strpos( $struct, '%minute%' ) !== false && strpos( $struct, '%second%' ) !== false )
						) {
					$post = true;
					if ( strpos( $struct, '%pagename%' ) !== false ) {
						$page = true;
					}
				}

				if ( ! $post ) {
					// For custom post types, we need to add on endpoints as well.
					foreach ( get_post_types( array( '_builtin' => false ) ) as $ptype ) {
						if ( strpos( $struct, "%$ptype%" ) !== false ) {
							$post = true;

							// This is for page style attachment URLs.
							$page = is_post_type_hierarchical( $ptype );
							break;
						}
					}
				}

				// If creating rules for a permalink, do all the endpoints like attachments etc.
				if ( $post ) {
					// Create query and regex for trackback.
					$trackbackmatch = $match . $trackbackregex;
					$trackbackquery = $trackbackindex . '?' . $query . '&tb=1';

					// Create query and regex for embeds.
					$embedmatch = $match . $embedregex;
					$embedquery = $embedindex . '?' . $query . '&embed=true';

					// Trim slashes from the end of the regex for this dir.
					$match = rtrim( $match, '/' );

					// Get rid of brackets.
					$submatchbase = str_replace( array( '(', ')' ), '', $match );

					// Add a rule for at attachments, which take the form of <permalink>/some-text.
					$sub1 = $submatchbase . '/([^/]+)/';

					// Add trackback regex <permalink>/trackback/...
					$sub1tb = $sub1 . $trackbackregex;

					// And <permalink>/feed/(atom|...)
					$sub1feed = $sub1 . $feedregex;

					// And <permalink>/(feed|atom...)
					$sub1feed2 = $sub1 . $feedregex2;

					// And <permalink>/comment-page-xx
					$sub1comment = $sub1 . $commentregex;

					// And <permalink>/embed/...
					$sub1embed = $sub1 . $embedregex;

					/*
					 * Add another rule to match attachments in the explicit form:
					 * <permalink>/attachment/some-text
					 */
					$sub2 = $submatchbase . '/attachment/([^/]+)/';

					// And add trackbacks <permalink>/attachment/trackback.
					$sub2tb = $sub2 . $trackbackregex;

					// Feeds, <permalink>/attachment/feed/(atom|...)
					$sub2feed = $sub2 . $feedregex;

					// And feeds again on to this <permalink>/attachment/(feed|atom...)
					$sub2feed2 = $sub2 . $feedregex2;

					// And <permalink>/comment-page-xx
					$sub2comment = $sub2 . $commentregex;

					// And <permalink>/embed/...
					$sub2embed = $sub2 . $embedregex;

					// Create queries for these extra tag-ons we've just dealt with.
					$subquery        = $index . '?attachment=' . $this->preg_index( 1 );
					$subtbquery      = $subquery . '&tb=1';
					$subfeedquery    = $subquery . '&feed=' . $this->preg_index( 2 );
					$subcommentquery = $subquery . '&cpage=' . $this->preg_index( 2 );
					$subembedquery   = $subquery . '&embed=true';

					// Do endpoints for attachments.
					if ( ! empty( $endpoints ) ) {
						foreach ( (array) $ep_query_append as $regex => $ep ) {
							if ( $ep[0] & EP_ATTACHMENT ) {
								$rewrite[ $sub1 . $regex ] = $subquery . $ep[1] . $this->preg_index( 3 );
								$rewrite[ $sub2 . $regex ] = $subquery . $ep[1] . $this->preg_index( 3 );
							}
						}
					}

					/*
					 * Now we've finished with endpoints, finish off the $sub1 and $sub2 matches
					 * add a ? as we don't have to match that last slash, and finally a $ so we
					 * match to the end of the URL
					 */
					$sub1 .= '?$';
					$sub2 .= '?$';

					/*
					 * Post pagination, e.g. <permalink>/2/
					 * Previously: '(/[0-9]+)?/?$', which produced '/2' for page.
					 * When cast to int, returned 0.
					 */
					$match = $match . '(?:/([0-9]+))?/?$';
					$query = $index . '?' . $query . '&page=' . $this->preg_index( $num_toks + 1 );

					// Not matching a permalink so this is a lot simpler.
				} else {
					// Close the match and finalise the query.
					$match .= '?$';
					$query  = $index . '?' . $query;
				}

				/*
				 * Create the final array for this dir by joining the $rewrite array (which currently
				 * only contains rules/queries for trackback, pages etc) to the main regex/query for
				 * this dir
				 */
				$rewrite = array_merge( $rewrite, array( $match => $query ) );

				// If we're matching a permalink, add those extras (attachments etc) on.
				if ( $post ) {
					// Add trackback.
					$rewrite = array_merge( array( $trackbackmatch => $trackbackquery ), $rewrite );

					// Add embed.
					$rewrite = array_merge( array( $embedmatch => $embedquery ), $rewrite );

					// Add regexes/queries for attachments, attachment trackbacks and so on.
					if ( ! $page ) {
						// Require <permalink>/attachment/stuff form for pages because of confusion with subpages.
						$rewrite = array_merge(
							$rewrite,
							array(
								$sub1        => $subquery,
								$sub1tb      => $subtbquery,
								$sub1feed    => $subfeedquery,
								$sub1feed2   => $subfeedquery,
								$sub1comment => $subcommentquery,
								$sub1embed   => $subembedquery,
							)
						);
					}

					$rewrite = array_merge(
						array(
							$sub2        => $subquery,
							$sub2tb      => $subtbquery,
							$sub2feed    => $subfeedquery,
							$sub2feed2   => $subfeedquery,
							$sub2comment => $subcommentquery,
							$sub2embed   => $subembedquery,
						),
						$rewrite
					);
				}
			}
			// Add the rules for this dir to the accumulating $post_rewrite.
			$post_rewrite = array_merge( $rewrite, $post_rewrite );
		}

		// The finished rules. phew!
		return $post_rewrite;
	}

	/**
	 * Generates rewrite rules with permalink structure and walking directory only.
	 *
	 * Shorten version of WP_Rewrite::generate_rewrite_rules() that allows for shorter
	 * list of parameters. See the method for longer description of what generating
	 * rewrite rules does.
	 *
	 * @since 1.5.0
	 *
	 * @see WP_Rewrite::generate_rewrite_rules() See for long description and rest of parameters.
	 *
	 * @param string $permalink_structure The permalink structure to generate rules.
	 * @param bool   $walk_dirs           Optional. Whether to create list of directories to walk over.
	 *                                    Default false.
	 * @return array
	 */
	public function generate_rewrite_rule( $permalink_structure, $walk_dirs = false ) {
		return $this->generate_rewrite_rules( $permalink_structure, EP_NONE, false, false, false, $walk_dirs );
	}

	/**
	 * Constructs rewrite matches and queries from permalink structure.
	 *
	 * Runs the action {@see 'generate_rewrite_rules'} with the parameter that is an
	 * reference to the current WP_Rewrite instance to further manipulate the
	 * permalink structures and rewrite rules. Runs the {@see 'rewrite_rules_array'}
	 * filter on the full rewrite rule array.
	 *
	 * There are two ways to manipulate the rewrite rules, one by hooking into
	 * the {@see 'generate_rewrite_rules'} action and gaining full control of the
	 * object or just manipulating the rewrite rule array before it is passed
	 * from the function.
	 *
	 * @since 1.5.0
	 *
	 * @return string[] An associative array of matches and queries.
	 */
	public function rewrite_rules() {
		$rewrite = array();

		if ( empty( $this->permalink_structure ) ) {
			return $rewrite;
		}

		// robots.txt -- only if installed at the root.
		$home_path      = parse_url( home_url() );
		$robots_rewrite = ( empty( $home_path['path'] ) || '/' === $home_path['path'] ) ? array( 'robots\.txt$' => $this->index . '?robots=1' ) : array();

		// favicon.ico -- only if installed at the root.
		$favicon_rewrite = ( empty( $home_path['path'] ) || '/' === $home_path['path'] ) ? array( 'favicon\.ico$' => $this->index . '?favicon=1' ) : array();

		// Old feed and service files.
		$deprecated_files = array(
			'.*wp-(atom|rdf|rss|rss2|feed|commentsrss2)\.php$' => $this->index . '?feed=old',
			'.*wp-app\.php(/.*)?$' => $this->index . '?error=403',
		);

		// Registration rules.
		$registration_pages = array();
		if ( is_multisite() && is_main_site() ) {
			$registration_pages['.*wp-signup.php$']   = $this->index . '?signup=true';
			$registration_pages['.*wp-activate.php$'] = $this->index . '?activate=true';
		}

		// Deprecated.
		$registration_pages['.*wp-register.php$'] = $this->index . '?register=true';

		// Post rewrite rules.
		$post_rewrite = $this->generate_rewrite_rules( $this->permalink_structure, EP_PERMALINK );

		/**
		 * Filters rewrite rules used for "post" archives.
		 *
		 * @since 1.5.0
		 *
		 * @param string[] $post_rewrite Array of rewrite rules for posts, keyed by their regex pattern.
		 */
		$post_rewrite = apply_filters( 'post_rewrite_rules', $post_rewrite );

		// Date rewrite rules.
		$date_rewrite = $this->generate_rewrite_rules( $this->get_date_permastruct(), EP_DATE );

		/**
		 * Filters rewrite rules used for date archives.
		 *
		 * Likely date archives would include /yyyy/, /yyyy/mm/, and /yyyy/mm/dd/.
		 *
		 * @since 1.5.0
		 *
		 * @param string[] $date_rewrite Array of rewrite rules for date archives, keyed by their regex pattern.
		 */
		$date_rewrite = apply_filters( 'date_rewrite_rules', $date_rewrite );

		// Root-level rewrite rules.
		$root_rewrite = $this->generate_rewrite_rules( $this->root . '/', EP_ROOT );

		/**
		 * Filters rewrite rules used for root-level archives.
		 *
		 * Likely root-level archives would include pagination rules for the homepage
		 * as well as site-wide post feeds (e.g. /feed/, and /feed/atom/).
		 *
		 * @since 1.5.0
		 *
		 * @param string[] $root_rewrite Array of root-level rewrite rules, keyed by their regex pattern.
		 */
		$root_rewrite = apply_filters( 'root_rewrite_rules', $root_rewrite );

		// Comments rewrite rules.
		$comments_rewrite = $this->generate_rewrite_rules( $this->root . $this->comments_base, EP_COMMENTS, false, true, true, false );

		/**
		 * Filters rewrite rules used for comment feed archives.
		 *
		 * Likely comments feed archives include /comments/feed/, and /comments/feed/atom/.
		 *
		 * @since 1.5.0
		 *
		 * @param string[] $comments_rewrite Array of rewrite rules for the site-wide comments feeds, keyed by their regex pattern.
		 */
		$comments_rewrite = apply_filters( 'comments_rewrite_rules', $comments_rewrite );

		// Search rewrite rules.
		$search_structure = $this->get_search_permastruct();
		$search_rewrite   = $this->generate_rewrite_rules( $search_structure, EP_SEARCH );

		/**
		 * Filters rewrite rules used for search archives.
		 *
		 * Likely search-related archives include /search/search+query/ as well as
		 * pagination and feed paths for a search.
		 *
		 * @since 1.5.0
		 *
		 * @param string[] $search_rewrite Array of rewrite rules for search queries, keyed by their regex pattern.
		 */
		$search_rewrite = apply_filters( 'search_rewrite_rules', $search_rewrite );

		// Author rewrite rules.
		$author_rewrite = $this->generate_rewrite_rules( $this->get_author_permastruct(), EP_AUTHORS );

		/**
		 * Filters rewrite rules used for author archives.
		 *
		 * Likely author archives would include /author/author-name/, as well as
		 * pagination and feed paths for author archives.
		 *
		 * @since 1.5.0
		 *
		 * @param string[] $author_rewrite Array of rewrite rules for author archives, keyed by their regex pattern.
		 */
		$author_rewrite = apply_filters( 'author_rewrite_rules', $author_rewrite );

		// Pages rewrite rules.
		$page_rewrite = $this->page_rewrite_rules();

		/**
		 * Filters rewrite rules used for "page" post type archives.
		 *
		 * @since 1.5.0
		 *
		 * @param string[] $page_rewrite Array of rewrite rules for the "page" post type, keyed by their regex pattern.
		 */
		$page_rewrite = apply_filters( 'page_rewrite_rules', $page_rewrite );

		// Extra permastructs.
		foreach ( $this->extra_permastructs as $permastructname => $struct ) {
			if ( is_array( $struct ) ) {
				if ( count( $struct ) == 2 ) {
					$rules = $this->generate_rewrite_rules( $struct[0], $struct[1] );
				} else {
					$rules = $this->generate_rewrite_rules( $struct['struct'], $struct['ep_mask'], $struct['paged'], $struct['feed'], $struct['forcomments'], $struct['walk_dirs'], $struct['endpoints'] );
				}
			} else {
				$rules = $this->generate_rewrite_rules( $struct );
			}

			/**
			 * Filters rewrite rules used for individual permastructs.
			 *
			 * The dynamic portion of the hook name, `$permastructname`, refers
			 * to the name of the registered permastruct, e.g. 'post_tag' (tags),
			 * 'category' (categories), etc.
			 *
			 * @since 3.1.0
			 *
			 * @param string[] $rules Array of rewrite rules generated for the current permastruct, keyed by their regex pattern.
			 */
			$rules = apply_filters( "{$permastructname}_rewrite_rules", $rules );

			if ( 'post_tag' === $permastructname ) {

				/**
				 * Filters rewrite rules used specifically for Tags.
				 *
				 * @since 2.3.0
				 * @deprecated 3.1.0 Use {@see 'post_tag_rewrite_rules'} instead.
				 *
				 * @param string[] $rules Array of rewrite rules generated for tags, keyed by their regex pattern.
				 */
				$rules = apply_filters_deprecated( 'tag_rewrite_rules', array( $rules ), '3.1.0', 'post_tag_rewrite_rules' );
			}

			$this->extra_rules_top = array_merge( $this->extra_rules_top, $rules );
		}

		// Put them together.
		if ( $this->use_verbose_page_rules ) {
			$this->rules = array_merge( $this->extra_rules_top, $robots_rewrite, $favicon_rewrite, $deprecated_files, $registration_pages, $root_rewrite, $comments_rewrite, $search_rewrite, $author_rewrite, $date_rewrite, $page_rewrite, $post_rewrite, $this->extra_rules );
		} else {
			$this->rules = array_merge( $this->extra_rules_top, $robots_rewrite, $favicon_rewrite, $deprecated_files, $registration_pages, $root_rewrite, $comments_rewrite, $search_rewrite, $author_rewrite, $date_rewrite, $post_rewrite, $page_rewrite, $this->extra_rules );
		}

		/**
		 * Fires after the rewrite rules are generated.
		 *
		 * @since 1.5.0
		 *
		 * @param WP_Rewrite $this Current WP_Rewrite instance (passed by reference).
		 */
		do_action_ref_array( 'generate_rewrite_rules', array( &$this ) );

		/**
		 * Filters the full set of generated rewrite rules.
		 *
		 * @since 1.5.0
		 *
		 * @param string[] $rules The compiled array of rewrite rules, keyed by their regex pattern.
		 */
		$this->rules = apply_filters( 'rewrite_rules_array', $this->rules );

		return $this->rules;
	}

	/**
	 * Retrieves the rewrite rules.
	 *
	 * The difference between this method and WP_Rewrite::rewrite_rules() is that
	 * this method stores the rewrite rules in the 'rewrite_rules' option and retrieves
	 * it. This prevents having to process all of the permalinks to get the rewrite rules
	 * in the form of caching.
	 *
	 * @since 1.5.0
	 *
	 * @return string[] Array of rewrite rules keyed by their regex pattern.
	 */
	public function wp_rewrite_rules() {
		$this->rules = get_option( 'rewrite_rules' );
		if ( empty( $this->rules ) ) {
			$this->matches = 'matches';
			$this->rewrite_rules();
			if ( ! did_action( 'wp_loaded' ) ) {
				add_action( 'wp_loaded', array( $this, 'flush_rules' ) );
				return $this->rules;
			}
			update_option( 'rewrite_rules', $this->rules );
		}

		return $this->rules;
	}

	/**
	 * Retrieves mod_rewrite-formatted rewrite rules to write to .htaccess.
	 *
	 * Does not actually write to the .htaccess file, but creates the rules for
	 * the process that will.
	 *
	 * Will add the non_wp_rules property rules to the .htaccess file before
	 * the WordPress rewrite rules one.
	 *
	 * @since 1.5.0
	 *
	 * @return string
	 */
	public function mod_rewrite_rules() {
		if ( ! $this->using_permalinks() ) {
			return '';
		}

		$site_root = parse_url( site_url() );
		if ( isset( $site_root['path'] ) ) {
			$site_root = trailingslashit( $site_root['path'] );
		}

		$home_root = parse_url( home_url() );
		if ( isset( $home_root['path'] ) ) {
			$home_root = trailingslashit( $home_root['path'] );
		} else {
			$home_root = '/';
		}

		$rules  = "<IfModule mod_rewrite.c>\n";
		$rules .= "RewriteEngine On\n";
		$rules .= "RewriteBase $home_root\n";

		// Prevent -f checks on index.php.
		$rules .= "RewriteRule ^index\.php$ - [L]\n";

		// Add in the rules that don't redirect to WP's index.php (and thus shouldn't be handled by WP at all).
		foreach ( (array) $this->non_wp_rules as $match => $query ) {
			// Apache 1.3 does not support the reluctant (non-greedy) modifier.
			$match = str_replace( '.+?', '.+', $match );

			$rules .= 'RewriteRule ^' . $match . ' ' . $home_root . $query . " [QSA,L]\n";
		}

		if ( $this->use_verbose_rules ) {
			$this->matches = '';
			$rewrite       = $this->rewrite_rules();
			$num_rules     = count( $rewrite );
			$rules        .= "RewriteCond %{REQUEST_FILENAME} -f [OR]\n" .
				"RewriteCond %{REQUEST_FILENAME} -d\n" .
				"RewriteRule ^.*$ - [S=$num_rules]\n";

			foreach ( (array) $rewrite as $match => $query ) {
				// Apache 1.3 does not support the reluctant (non-greedy) modifier.
				$match = str_replace( '.+?', '.+', $match );

				if ( strpos( $query, $this->index ) !== false ) {
					$rules .= 'RewriteRule ^' . $match . ' ' . $home_root . $query . " [QSA,L]\n";
				} else {
					$rules .= 'RewriteRule ^' . $match . ' ' . $site_root . $query . " [QSA,L]\n";
				}
			}
		} else {
			$rules .= "RewriteCond %{REQUEST_FILENAME} !-f\n" .
				"RewriteCond %{REQUEST_FILENAME} !-d\n" .
				"RewriteRule . {$home_root}{$this->index} [L]\n";
		}

		$rules .= "</IfModule>\n";

		/**
		 * Filters the list of rewrite rules formatted for output to an .htaccess file.
		 *
		 * @since 1.5.0
		 *
		 * @param string $rules mod_rewrite Rewrite rules formatted for .htaccess.
		 */
		$rules = apply_filters( 'mod_rewrite_rules', $rules );

		/**
		 * Filters the list of rewrite rules formatted for output to an .htaccess file.
		 *
		 * @since 1.5.0
		 * @deprecated 1.5.0 Use the {@see 'mod_rewrite_rules'} filter instead.
		 *
		 * @param string $rules mod_rewrite Rewrite rules formatted for .htaccess.
		 */
		return apply_filters_deprecated( 'rewrite_rules', array( $rules ), '1.5.0', 'mod_rewrite_rules' );
	}

	/**
	 * Retrieves IIS7 URL Rewrite formatted rewrite rules to write to web.config file.
	 *
	 * Does not actually write to the web.config file, but creates the rules for
	 * the process that will.
	 *
	 * @since 2.8.0
	 *
	 * @param bool $add_parent_tags Optional. Whether to add parent tags to the rewrite rule sets.
	 *                              Default false.
	 * @return string IIS7 URL rewrite rule sets.
	 */
	public function iis7_url_rewrite_rules( $add_parent_tags = false ) {
		if ( ! $this->using_permalinks() ) {
			return '';
		}
		$rules = '';
		if ( $add_parent_tags ) {
			$rules .= '<configuration>
	<system.webServer>
		<rewrite>
			<rules>';
		}

		$rules .= '
			<rule name="WordPress: ' . esc_attr( home_url() ) . '" patternSyntax="Wildcard">
				<match url="*" />
					<conditions>
						<add input="{REQUEST_FILENAME}" matchType="IsFile" negate="true" />
						<add input="{REQUEST_FILENAME}" matchType="IsDirectory" negate="true" />
					</conditions>
				<action type="Rewrite" url="index.php" />
			</rule>';

		if ( $add_parent_tags ) {
			$rules .= '
			</rules>
		</rewrite>
	</system.webServer>
</configuration>';
		}

		/**
		 * Filters the list of rewrite rules formatted for output to a web.config.
		 *
		 * @since 2.8.0
		 *
		 * @param string $rules Rewrite rules formatted for IIS web.config.
		 */
		return apply_filters( 'iis7_url_rewrite_rules', $rules );
	}

	/**
	 * Adds a rewrite rule that transforms a URL structure to a set of query vars.
	 *
	 * Any value in the $after parameter that isn't 'bottom' will result in the rule
	 * being placed at the top of the rewrite rules.
	 *
	 * @since 2.1.0
	 * @since 4.4.0 Array support was added to the `$query` parameter.
	 *
	 * @param string       $regex Regular expression to match request against.
	 * @param string|array $query The corresponding query vars for this rewrite rule.
	 * @param string       $after Optional. Priority of the new rule. Accepts 'top'
	 *                            or 'bottom'. Default 'bottom'.
	 */
	public function add_rule( $regex, $query, $after = 'bottom' ) {
		if ( is_array( $query ) ) {
			$external = false;
			$query    = add_query_arg( $query, 'index.php' );
		} else {
			$index = false === strpos( $query, '?' ) ? strlen( $query ) : strpos( $query, '?' );
			$front = substr( $query, 0, $index );

			$external = $front != $this->index;
		}

		// "external" = it doesn't correspond to index.php.
		if ( $external ) {
			$this->add_external_rule( $regex, $query );
		} else {
			if ( 'bottom' === $after ) {
				$this->extra_rules = array_merge( $this->extra_rules, array( $regex => $query ) );
			} else {
				$this->extra_rules_top = array_merge( $this->extra_rules_top, array( $regex => $query ) );
			}
		}
	}

	/**
	 * Adds a rewrite rule that doesn't correspond to index.php.
	 *
	 * @since 2.1.0
	 *
	 * @param string $regex Regular expression to match request against.
	 * @param string $query The corresponding query vars for this rewrite rule.
	 */
	public function add_external_rule( $regex, $query ) {
		$this->non_wp_rules[ $regex ] = $query;
	}

	/**
	 * Adds an endpoint, like /trackback/.
	 *
	 * @since 2.1.0
	 * @since 3.9.0 $query_var parameter added.
	 * @since 4.3.0 Added support for skipping query var registration by passing `false` to `$query_var`.
	 *
	 * @see add_rewrite_endpoint() for full documentation.
	 * @global WP $wp Current WordPress environment instance.
	 *
	 * @param string      $name      Name of the endpoint.
	 * @param int         $places    Endpoint mask describing the places the endpoint should be added.
	 * @param string|bool $query_var Optional. Name of the corresponding query variable. Pass `false` to
	 *                               skip registering a query_var for this endpoint. Defaults to the
	 *                               value of `$name`.
	 */
	public function add_endpoint( $name, $places, $query_var = true ) {
		global $wp;

		// For backward compatibility, if null has explicitly been passed as `$query_var`, assume `true`.
		if ( true === $query_var || null === $query_var ) {
			$query_var = $name;
		}
		$this->endpoints[] = array( $places, $name, $query_var );

		if ( $query_var ) {
			$wp->add_query_var( $query_var );
		}
	}

	/**
	 * Adds a new permalink structure.
	 *
	 * A permalink structure (permastruct) is an abstract definition of a set of rewrite rules;
	 * it is an easy way of expressing a set of regular expressions that rewrite to a set of
	 * query strings. The new permastruct is added to the WP_Rewrite::$extra_permastructs array.
	 *
	 * When the rewrite rules are built by WP_Rewrite::rewrite_rules(), all of these extra
	 * permastructs are passed to WP_Rewrite::generate_rewrite_rules() which transforms them
	 * into the regular expressions that many love to hate.
	 *
	 * The `$args` parameter gives you control over how WP_Rewrite::generate_rewrite_rules()
	 * works on the new permastruct.
	 *
	 * @since 2.5.0
	 *
	 * @param string $name   Name for permalink structure.
	 * @param string $struct Permalink structure (e.g. category/%category%)
	 * @param array  $args   {
	 *     Optional. Arguments for building rewrite rules based on the permalink structure.
	 *     Default empty array.
	 *
	 *     @type bool $with_front  Whether the structure should be prepended with `WP_Rewrite::$front`.
	 *                             Default true.
	 *     @type int  $ep_mask     The endpoint mask defining which endpoints are added to the structure.
	 *                             Accepts `EP_NONE`, `EP_PERMALINK`, `EP_ATTACHMENT`, `EP_DATE`, `EP_YEAR`,
	 *                             `EP_MONTH`, `EP_DAY`, `EP_ROOT`, `EP_COMMENTS`, `EP_SEARCH`, `EP_CATEGORIES`,
	 *                             `EP_TAGS`, `EP_AUTHORS`, `EP_PAGES`, `EP_ALL_ARCHIVES`, and `EP_ALL`.
	 *                             Default `EP_NONE`.
	 *     @type bool $paged       Whether archive pagination rules should be added for the structure.
	 *                             Default true.
	 *     @type bool $feed        Whether feed rewrite rules should be added for the structure. Default true.
	 *     @type bool $forcomments Whether the feed rules should be a query for a comments feed. Default false.
	 *     @type bool $walk_dirs   Whether the 'directories' making up the structure should be walked over
	 *                             and rewrite rules built for each in-turn. Default true.
	 *     @type bool $endpoints   Whether endpoints should be applied to the generated rules. Default true.
	 * }
	 */
	public function add_permastruct( $name, $struct, $args = array() ) {
		// Back-compat for the old parameters: $with_front and $ep_mask.
		if ( ! is_array( $args ) ) {
			$args = array( 'with_front' => $args );
		}
		if ( func_num_args() == 4 ) {
			$args['ep_mask'] = func_get_arg( 3 );
		}

		$defaults = array(
			'with_front'  => true,
			'ep_mask'     => EP_NONE,
			'paged'       => true,
			'feed'        => true,
			'forcomments' => false,
			'walk_dirs'   => true,
			'endpoints'   => true,
		);
		$args     = array_intersect_key( $args, $defaults );
		$args     = wp_parse_args( $args, $defaults );

		if ( $args['with_front'] ) {
			$struct = $this->front . $struct;
		} else {
			$struct = $this->root . $struct;
		}
		$args['struct'] = $struct;

		$this->extra_permastructs[ $name ] = $args;
	}

	/**
	 * Removes a permalink structure.
	 *
	 * @since 4.5.0
	 *
	 * @param string $name Name for permalink structure.
	 */
	public function remove_permastruct( $name ) {
		unset( $this->extra_permastructs[ $name ] );
	}

	/**
	 * Removes rewrite rules and then recreate rewrite rules.
	 *
	 * Calls WP_Rewrite::wp_rewrite_rules() after removing the 'rewrite_rules' option.
	 * If the function named 'save_mod_rewrite_rules' exists, it will be called.
	 *
	 * @since 2.0.1
	 *
	 * @param bool $hard Whether to update .htaccess (hard flush) or just update rewrite_rules option (soft flush). Default is true (hard).
	 */
	public function flush_rules( $hard = true ) {
		static $do_hard_later = null;

		// Prevent this action from running before everyone has registered their rewrites.
		if ( ! did_action( 'wp_loaded' ) ) {
			add_action( 'wp_loaded', array( $this, 'flush_rules' ) );
			$do_hard_later = ( isset( $do_hard_later ) ) ? $do_hard_later || $hard : $hard;
			return;
		}

		if ( isset( $do_hard_later ) ) {
			$hard = $do_hard_later;
			unset( $do_hard_later );
		}

		update_option( 'rewrite_rules', '' );
		$this->wp_rewrite_rules();

		/**
		 * Filters whether a "hard" rewrite rule flush should be performed when requested.
		 *
		 * A "hard" flush updates .htaccess (Apache) or web.config (IIS).
		 *
		 * @since 3.7.0
		 *
		 * @param bool $hard Whether to flush rewrite rules "hard". Default true.
		 */
		if ( ! $hard || ! apply_filters( 'flush_rewrite_rules_hard', true ) ) {
			return;
		}
		if ( function_exists( 'save_mod_rewrite_rules' ) ) {
			save_mod_rewrite_rules();
		}
		if ( function_exists( 'iis7_save_url_rewrite_rules' ) ) {
			iis7_save_url_rewrite_rules();
		}
	}

	/**
	 * Sets up the object's properties.
	 *
	 * The 'use_verbose_page_rules' object property will be set to true if the
	 * permalink structure begins with one of the following: '%postname%', '%category%',
	 * '%tag%', or '%author%'.
	 *
	 * @since 1.5.0
	 */
	public function init() {
		$this->extra_rules         = array();
		$this->non_wp_rules        = array();
		$this->endpoints           = array();
		$this->permalink_structure = get_option( 'permalink_structure' );
		$this->front               = substr( $this->permalink_structure, 0, strpos( $this->permalink_structure, '%' ) );
		$this->root                = '';

		if ( $this->using_index_permalinks() ) {
			$this->root = $this->index . '/';
		}

		unset( $this->author_structure );
		unset( $this->date_structure );
		unset( $this->page_structure );
		unset( $this->search_structure );
		unset( $this->feed_structure );
		unset( $this->comment_feed_structure );

		$this->use_trailing_slashes = ( '/' === substr( $this->permalink_structure, -1, 1 ) );

		// Enable generic rules for pages if permalink structure doesn't begin with a wildcard.
		if ( preg_match( '/^[^%]*%(?:postname|category|tag|author)%/', $this->permalink_structure ) ) {
			$this->use_verbose_page_rules = true;
		} else {
			$this->use_verbose_page_rules = false;
		}
	}

	/**
	 * Sets the main permalink structure for the site.
	 *
	 * Will update the 'permalink_structure' option, if there is a difference
	 * between the current permalink structure and the parameter value. Calls
	 * WP_Rewrite::init() after the option is updated.
	 *
	 * Fires the {@see 'permalink_structure_changed'} action once the init call has
	 * processed passing the old and new values
	 *
	 * @since 1.5.0
	 *
	 * @param string $permalink_structure Permalink structure.
	 */
	public function set_permalink_structure( $permalink_structure ) {
		if ( $permalink_structure != $this->permalink_structure ) {
			$old_permalink_structure = $this->permalink_structure;
			update_option( 'permalink_structure', $permalink_structure );

			$this->init();

			/**
			 * Fires after the permalink structure is updated.
			 *
			 * @since 2.8.0
			 *
			 * @param string $old_permalink_structure The previous permalink structure.
			 * @param string $permalink_structure     The new permalink structure.
			 */
			do_action( 'permalink_structure_changed', $old_permalink_structure, $permalink_structure );
		}
	}

	/**
	 * Sets the category base for the category permalink.
	 *
	 * Will update the 'category_base' option, if there is a difference between
	 * the current category base and the parameter value. Calls WP_Rewrite::init()
	 * after the option is updated.
	 *
	 * @since 1.5.0
	 *
	 * @param string $category_base Category permalink structure base.
	 */
	public function set_category_base( $category_base ) {
		if ( get_option( 'category_base' ) !== $category_base ) {
			update_option( 'category_base', $category_base );
			$this->init();
		}
	}

	/**
	 * Sets the tag base for the tag permalink.
	 *
	 * Will update the 'tag_base' option, if there is a difference between the
	 * current tag base and the parameter value. Calls WP_Rewrite::init() after
	 * the option is updated.
	 *
	 * @since 2.3.0
	 *
	 * @param string $tag_base Tag permalink structure base.
	 */
	public function set_tag_base( $tag_base ) {
		if ( get_option( 'tag_base' ) !== $tag_base ) {
			update_option( 'tag_base', $tag_base );
			$this->init();
		}
	}

	/**
	 * Constructor - Calls init(), which runs setup.
	 *
	 * @since 1.5.0
	 */
	public function __construct() {
		$this->init();
	}
}

Cвязанные функции

Из метки: Rewrite (ЧПУ перезапись)

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