Generate URL Slug for CakePHP

url_slug.php

    // Creates a URL Slug
    function _url_slug($string) {
        $string = strtolower(trim($string));
        $string = preg_replace('/[^a-z0-9-]/', '-', $string);
        $string = preg_replace('/-+/', "-", $string);

        return $string;
    }

    // Gets a Unique slug string by checking in the database
    function _getSlug($name, $area, $model) {
        $this->$model->Area->recursive = -1;
        $areaSlug = $this->$model->Area->read('slug', $area);

        $name = $name . ' ' . $areaSlug['Area']['slug'];
        $slug = $slug_copy = $this->_url_slug($name);

        $i = 1;
        while ($this->$model->find('count', array('conditions' => array($model . '.slug' =>
            $slug))) == true) {
            $slug = $slug_copy . '-' . $i;
            $i++;
        }

        return $slug;
    }