常用函数

//escape编码， 解决中文传输
function escape($str){
    $res = @unpack("H*",iconv("GB2312","UCS-2",$str));
    $res = preg_replace("/(.{4})/is","%u\\1",$res[1]);
    return $res;
}
//unescape解码， 解决中文传输
function unescape($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);
}