WordPress at a glance
filter is not described

wp_admin_css_uri filter-hook . WP 2.3.0

Filters the URI of a WordPress admin CSS file.

Usage

add_filter( 'wp_admin_css_uri', 'filter_function_name_4240', 10, 2 );
function filter_function_name_4240( $_file, $file ){
	// filter...

	return $_file;
}
$_file(string)
Relative path to the file with query arguments attached.
$file(string)
Relative path to the file, minus its ".css" extension.

Where the hook is called

wp_admin_css_uri()
wp_admin_css_uri
wp-includes/general-template.php 4009
return apply_filters( 'wp_admin_css_uri', $_file, $file );

Where the hook is used (in WP core)

Does not used.