PHP: String to ID

PHP: String to ID

	function toID($string) {
	    //Lower case everything
	    $string = strtolower($string);
	    //Make alphanumeric (removes all other characters)
	    $string = preg_replace("/[^a-z0-9_\s-]/", "", $string);
	    //Clean up multiple dashes or whitespaces
	    $string = preg_replace("/[\s-]+/", " ", $string);
	    //Convert whitespaces and underscore to dash
	    $string = preg_replace("/[\s_]/", "-", $string);
	    return $string;
	}