Php li class="active" для ссылки

if(!defined('DATALIFEENGINE')){ die("Hacking attempt!"); }

function CategoryMenu($categoryid = 0, $parentid = 0, $returnstring = '') {
global $cat_info, $user_group, $member_id;
$allow_list = explode( ',', $user_group[$member_id['user_group']]['cat_allow_addnews'] );
$root_category = array ();
if( count( $cat_info ) ) {
foreach ( $cat_info as $cats ) {
if( $cats['parentid'] == $parentid ) $root_category[] = $cats['id'];
}
if( count( $root_category ) ) {
foreach ( $root_category as $id ) {
if( $allow_list[0] == "all" or in_array( $id, $allow_list ) ) {
$returnstring .= "<li><a href=\"/".$cat_info[$id]['alt_name']."/\">" . $cat_info[$id]['name'] . "</a></li>";
}
$returnstring = CategoryMenu( $categoryid, $id, $returnstring );
}
}
}
return $returnstring;
}
echo CategoryMenu(0, 0);