trying to unescape with z function

echo unescape("%u65E0%u5FE7%u811A%u672C%u811A%u672C%u6280%u672F%u8BA8%u8BBA%u7248escape%u7F16%u7801%u540E%u5982%u4F55%u7528php%u8FDB%u884C%u89E3%u7801%3F");
function unescape($str)
{
         $str = rawurldecode($str);
         preg_match_all("/%u.{4}|&#x.{4};|&#d+;|.+/U",$str,$r);
         $ar = $r[0];
         foreach($ar as $k=>$v)
         {
                  if(substr($v,0,2) == "%u")
                           $ar[$k] = iconv("UCS-2","GBK",pack("H4",substr($v,-4)));
                  elseif(substr($v,0,3) == "&#x")
                           $ar[$k] = iconv("UCS-2","GBK",pack("H4",substr($v,3,-1)));
                  elseif(substr($v,0,2) == "&#")
                         {
                           $ar[$k] = iconv("UCS-2","GBK",pack("n",substr($v,2,-1)));
                          }
         }
         return join("",$ar);
}

两个版本的.
<?php
function escape($str){
$res = @unpack("H*",iconv("utf-8","UCS-2",$str));
$res = preg_replace("/(.{4})/is","%u\\1",$res[1]);
return $res;
}
function unescape($str) {
         $str = rawurldecode($str);
         preg_match_all("/%u.{4}|&#x.{4};|&#\d+;|.+/U",$str,$r);
         $ar = $r[0];
         foreach($ar as $k=>$v) {
                  if(substr($v,0,2) == "%u")
                           $ar[$k] = iconv("UCS-2","utf-8",pack("H4",substr($v,-4)));
                  elseif(substr($v,0,3) == "&#x")
                           $ar[$k] = iconv("UCS-2","utf-8",pack("H4",substr($v,3,-1)));
                  elseif(substr($v,0,2) == "&#") {
                           $ar[$k] = iconv("UCS-2","utf-8",pack("n",substr($v,2,-1)));
                  }
         }
         return join("",$ar);
} 

function escape1($str){
    $sublen=strlen($str);
    $reString="";
    for ($i=0;$i<$sublen;$i++){
        if(ord($str[$i])>=127){
            $tmpString=bin2hex(iconv("GBK","ucs-2",substr($str,$i,2)));    //此处GBK为目标代码的编码格式，请实际情况修改

            if (!eregi("WIN",PHP_OS)){
                $tmpString=substr($tmpString,2,2).substr($tmpString,0,2);
            }
            $reString.="%u".$tmpString;
            $i++;
        } else {
            $reString.="%".dechex(ord($str[$i]));
        }
    }
    return $reString;
}

function unescape1($str) {
         $str = rawurldecode($str);
         preg_match_all("/%u.{4}|&#x.{4};|&#\d+;|.+/U",$str,$r);
         $ar = $r[0];
         foreach($ar as $k=>$v) {
                  if(substr($v,0,2) == "%u")
$ar[$k] =!eregi("WIN",PHP_OS)?iconv("UCS-2","GBK",strrev(pack("H4",substr($v,-4)))):iconv("UCS-2","gb2312",pack("H4",substr($v,-4)));
                  elseif(substr($v,0,3) == "&#x")
                           $ar[$k] = iconv("UCS-2","GBK",pack("H4",substr($v,3,-1)));
                  elseif(substr($v,0,2) == "&#") {
                           $ar[$k] = iconv("UCS-2","GBK",pack("n",substr($v,2,-1)));
                  }
         }
         return join("",$ar);
}
?>

我是用下面这个，只支持 utf-8 ，不需要 iconv 模块支持！个人感觉蛮好用的！

<?php
function js_unescape( $str ){
    $ret = '';
    $len = strlen($str);

    for ($i = 0; $i < $len; $i++){

        if ($str[$i] == '%' && $str[$i+1] == 'u'){
            $val = hexdec(substr($str, $i+2, 4));
            if ($val < 0x7f) $ret .= chr($val);
            else if($val < 0x800) $ret .= chr(0xc0 |($val>>6)).chr(0x80 |($val&0x3f));
            else $ret .= chr(0xe0 |($val>>12)).chr(0x80 |(($val>>6)&0x3f)).chr(0x80 |($val&0x3f));

            $i += 5;

        }else if ($str[$i] == '%'){
            $ret .= urldecode(substr($str, $i, 3));
            $i += 2;

        }else
            $ret .= $str[$i];
    }
    return $ret;
}?>

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