php提供的URL编码函数是基于字节的，对由ie的javascript函数escape编码的数据就无能为力了。
因此在此共享本人的php版的escape/unescape函数

function escape($str) {
  preg_match_all("/[\x80-\xff].|[\x01-\x7f]+/",$str,$r);
  $ar = $r[0];
  foreach($ar as $k=>$v) {
    if(ord($v[0]) < 128)
      $ar[$k] = rawurlencode($v);
    else
      $ar[$k] = "%u".bin2hex(iconv("GB2312","UCS-2",$v));
  }
  return join("",$ar);
}

function unescape($str) {
  $str = rawurldecode($str);
  preg_match_all("/(?:%u.{4})|.+/",$str,$r);
  $ar = $r[0];
  foreach($ar as $k=>$v) {
    if(substr($v,0,2) == "%u" && strlen($v) == 6)
      $ar[$k] = iconv("UCS-2","GB2312",pack("H4",substr($v,-4)));
  }
  return join("",$ar);
}