<?
function str($var)
  {
    if (is_array($var))
      {
        foreach($var as $key => $val)
          {
            $var[$key] = str($val);
          }
      }
    else
      {
        $var = htmlentities(trim($var), ENT_QUOTES, 'UTF-8');
      }
    return $var;
  }
?>