public static function active( $url )
	{
		$url = parse_url( $url, PHP_URL_PATH );

		if ( empty( $url ) )
		{
			return false;
		}

		if ( $url[0] !== '/' )
		{
			$url = static::to( $url );
		}

		// when we are on "/" only "/" counts as active.
	 	if ( $url === '/' )
		{
			return static::current() == $url;
		}

		// for everything else we cut the url and compare
		$cut = substr( static::current(), 0, strlen( $url ) );

		return $cut == $url;
	}