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        {
           $utf = chr($dec);
       }
       else if ($dec        {
           $utf = chr(192 + (($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);
}