Generate a URL portion or alias from any text - uses alphanumeric characters and hyphens only.

gistfile1.php

<?php

    function generate_url_from_text($strText) {
        $strText = preg_replace('/[^A-Za-z0-9-]/', ' ', $strText);
        $strText = preg_replace('/ +/', ' ', $strText);
        $strText = trim($strText);
        $strText = str_replace(' ', '-', $strText);
        $strText = preg_replace('/-+/', '-', $strText);
        $strText = strtolower($strText);
        return $strText;
    }

?>