$article_title = '"Saxophone - do it yourself / in 5 minutes!"';
$formatted = preg_replace("([^\w-])",'-', strtolower($article_title));
$formatted = preg_replace("([\-]{2,})",'-',$formatted);
$formatted = ltrim($formatted, "-");
$formatted = rtrim($formatted, "-");
echo $formatted;
Результат:
saxophone-do-it-yourself-in-5-minutes
