_links_add_base( string $m )

This function’s access is marked private. This means it is not intended for use by plugin or theme developers, only in other core functions. It is listed here for completeness.

Callback to add a base url to relative links in passed content.

Parameters

$m

(string) (Required) The matched link.

Return

(string) The processed link.

Source

File: wp-includes/formatting.php

function _links_add_base( $m ) {
	global $_links_add_base;
	// 1 = attribute name  2 = quotation mark  3 = URL.
	return $m[1] . '=' . $m[2] .
		( preg_match( '#^(\w{1,20}):#', $m[3], $protocol ) && in_array( $protocol[1], wp_allowed_protocols(), true ) ?
			$m[3] :
			WP_Http::make_absolute_url( $m[3], $_links_add_base )
		)
		. $m[2];
}

Changelog

Version Description
2.7.0 Introduced.

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Licensed under the GNU GPLv2+ License.
https://developer.wordpress.org/reference/functions/_links_add_base