Wordpress Style Slug Generator function in php

gistfile1.php

function generateSlug($phrase, $maxLength=50){
  $result = strtolower($phrase);
	$result = preg_replace("/[^a-z0-9]/", "-", $result);
	$result = trim(preg_replace("/-+/", "-", $result));
	$result = trim(substr($result, 0, $maxLength));
	$result = preg_replace("/^-/", "", $result); 
	$result = preg_replace("/-$/", "", $result); 
	return $result;
}
// Pretty simple: keeps numbers and letters and makes everything else dashes.  Removes multiple dashes in a row.
// May not always match what WP generates but will always match what it generates.  Same string in = Same string out.