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.

_links_add_base( string $m )

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

Parameters

$m

(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() ) ?
			$m[3] :
			WP_Http::make_absolute_url( $m[3], $_links_add_base )
		)
		. $m[2];
}

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Related

Uses

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

Changelog
Version Description
WP-2.7.0 Introduced.