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функция не описана

YoastSEO_Vendor\Psr\Http\Message

MessageInterface::getHeaderLine() public Yoast 1.0

Retrieves a comma-separated string of the values for a single header.

This method returns all of the header values of the given case-insensitive header name as a string concatenated together using a comma.

NOTE: Not all header values may be appropriately represented using comma concatenation. For such headers, use getHeader() instead and supply your own delimiter when concatenating.

If the header does not appear in the message, this method MUST return an empty string.

{} Это метод класса: MessageInterface{}

Хуков нет.

Возвращает

Строку. A string of values as provided for the given header

    concatenated together using a comma. If the header does not appear in
	the message, this method MUST return an empty string.

Использование

$MessageInterface = new MessageInterface();
$MessageInterface->getHeaderLine( $name );
$name(строка) (обязательный)
Case-insensitive header field name.

Код MessageInterface::getHeaderLine() Yoast 15.3

<?php
public function getHeaderLine($name);