<?php

$uri = preg_replace("/?.*/i",'', $_SERVER['REQUEST_URI']);

if (strlen($uri)>1) {// если не главная страница...

  if (rtrim($uri,'/')!=$uri) {

    header("HTTP/1.1 301 Moved Permanently");

    header('Location: http://'.$_SERVER['SERVER_NAME'].str_replace($uri, rtrim($uri,'/'), $_SERVER['REQUEST_URI']));

    exit();    

  }

}

?>