W3cubDocs

/WordPress

_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];
}

Uses

Uses Description
wp-includes/class-http.php: WP_Http::make_absolute_url()

Converts a relative URL to an absolute URL relative to a given URL.
wp-includes/functions.php: wp_allowed_protocols()

Retrieve a list of protocols to allow in HTML attributes.

Changelog

Version Description
2.7.0 Introduced.

© 2003–2019 WordPress Foundation
Licensed under the GNU GPLv2+ License.
https://developer.wordpress.org/reference/functions/_links_add_base