remove_a_tag() in Wordpress

wp_remove_a_tag.php

function remove_a_tag($string, $postid, $slug = true) {

    $return = array();

    preg_match_all("/<a.*?>(.*?)<\/a>/", $string, $matches);

    foreach ($matches[1] as $key => $value) {

        if ($slug == true) {
            $return[] = sanitize_title($value);
        } else {
            $return[] = $value;
        }
    }

    return $return;
}