#li3 > Lithium Documentation > lithium/core/Libraries::map()

Associtates fully-namespaced class names to their corresponding paths on the file system.

Once a class is associtated to a path using `lithium\core\Libraries::map()` the PSR-0 loader or custom class loader setted using the `transform` or `loader` option of `lithium\core\Libraries::add()` are ignored and the associtated path is used instead.

Parameters

array $classes An array of fully-namespaced class names (as keys) and their correponding file's paths (as values).

Returns

void

Source

						public static function map(array $classes) {
		foreach ($classes as $key => $value) {
			unset(static::$_cachedPaths[$key]);
		}
		static::$_map = array_merge(static::$_map, $classes);
	}