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PHP的unicode解码程序免费下载

function utfdecode($url) //unicode解码
{
   preg_match_all("/%u([[:alnum:]]{4})/", $url, $a);
   foreach ($a[1] as $uniord)
   {
       $dec = hexdec($uniord);
       $utf = "";
       if ($dec < 128)
       {
           $utf = chr($dec);
       }
       else if ($dec < 2048)
       {
           $utf = chr(192 + (($dec - ($dec % 64)) / 64));
           $utf .= chr(128 + ($dec % 64));
       }
       else
       {
           $utf = chr(224 + (($dec - ($dec % 4096)) / 4096));
           $utf .= chr(128 + ((($dec % 4096) - ($dec % 64)) / 64));
           $utf .= chr(128 + ($dec % 64));
       }
       $url = str_replace("%u".$uniord, $utf, $url);
   }
   return urldecode($url);
}

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