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PHPMailer\PHPMailer

PHPMailer::encodeHeader() public WP 1.0

Encode a header value (not including its label) optimally. Picks shortest of Q, B, or none. Result includes folding if needed. See RFC822 definitions for phrase, comment and text positions.

{} Это метод класса: PHPMailer{}

Хуков нет.

Возвращает

Строку.

Использование

$PHPMailer = new PHPMailer();
$PHPMailer->encodeHeader( $str, $position );
$str(строка) (обязательный)
The header value to encode
$position(строка)
What context the string will be used in

Код PHPMailer::encodeHeader() WP 5.7.2

<?php
public function encodeHeader($str, $position = 'text')
{
    $matchcount = 0;
    switch (strtolower($position)) {
        case 'phrase':
            if (!preg_match('/[\200-\377]/', $str)) {
                //Can't use addslashes as we don't know the value of magic_quotes_sybase
                $encoded = addcslashes($str, "\0..\37\177\\\"");
                if (($str === $encoded) && !preg_match('/[^A-Za-z0-9!#$%&\'*+\/=?^_`{|}~ -]/', $str)) {
                    return $encoded;
                }

                return "\"$encoded\"";
            }
            $matchcount = preg_match_all('/[^\040\041\043-\133\135-\176]/', $str, $matches);
            break;
        /* @noinspection PhpMissingBreakStatementInspection */
        case 'comment':
            $matchcount = preg_match_all('/[()"]/', $str, $matches);
        //fallthrough
        case 'text':
        default:
            $matchcount += preg_match_all('/[\000-\010\013\014\016-\037\177-\377]/', $str, $matches);
            break;
    }

    if ($this->has8bitChars($str)) {
        $charset = $this->CharSet;
    } else {
        $charset = static::CHARSET_ASCII;
    }

    //Q/B encoding adds 8 chars and the charset ("` =?<charset>?[QB]?<content>?=`").
    $overhead = 8 + strlen($charset);

    if ('mail' === $this->Mailer) {
        $maxlen = static::MAIL_MAX_LINE_LENGTH - $overhead;
    } else {
        $maxlen = static::MAX_LINE_LENGTH - $overhead;
    }

    //Select the encoding that produces the shortest output and/or prevents corruption.
    if ($matchcount > strlen($str) / 3) {
        //More than 1/3 of the content needs encoding, use B-encode.
        $encoding = 'B';
    } elseif ($matchcount > 0) {
        //Less than 1/3 of the content needs encoding, use Q-encode.
        $encoding = 'Q';
    } elseif (strlen($str) > $maxlen) {
        //No encoding needed, but value exceeds max line length, use Q-encode to prevent corruption.
        $encoding = 'Q';
    } else {
        //No reformatting needed
        $encoding = false;
    }

    switch ($encoding) {
        case 'B':
            if ($this->hasMultiBytes($str)) {
                //Use a custom function which correctly encodes and wraps long
                //multibyte strings without breaking lines within a character
                $encoded = $this->base64EncodeWrapMB($str, "\n");
            } else {
                $encoded = base64_encode($str);
                $maxlen -= $maxlen % 4;
                $encoded = trim(chunk_split($encoded, $maxlen, "\n"));
            }
            $encoded = preg_replace('/^(.*)$/m', ' =?' . $charset . "?$encoding?\\1?=", $encoded);
            break;
        case 'Q':
            $encoded = $this->encodeQ($str, $position);
            $encoded = $this->wrapText($encoded, $maxlen, true);
            $encoded = str_replace('=' . static::$LE, "\n", trim($encoded));
            $encoded = preg_replace('/^(.*)$/m', ' =?' . $charset . "?$encoding?\\1?=", $encoded);
            break;
        default:
            return $str;
    }

    return trim(static::normalizeBreaks($encoded));
}