WordPress at a glance
filter is not described

admin_url filter-hook . WP 2.8.0

Filters the admin area URL.


add_filter( 'admin_url', 'filter_function_name_1763', 10, 3 );
function filter_function_name_1763( $url, $path, $blog_id ){
	// filter...

	return $url;
The complete admin area URL including scheme and path.
Path relative to the admin area URL. Blank string if no path is specified.
Site ID, or null for the current site.

Where the hook is called

wp-includes/link-template.php 3233
return apply_filters( 'admin_url', $url, $path, $blog_id );

Where the hook is used (in WP core)

Does not used.