function convertip($ip) {

      $ip1num = 0;

      $ip2num = 0;

      $ipAddr1 ="";

      $ipAddr2 ="";

      $dat_path = './QQWry.Dat';

      if(!preg_match("/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/", $ip)) {

        return 'IP Address Error';

      }

      if(!$fd = @fopen($dat_path, 'rb')){

        return 'IP date file not exists or access denied';

      }

      $ip = explode('.', $ip);

      $ipNum = $ip[0] * 16777216 + $ip[1] * 65536 + $ip[2] * 256 + $ip[3];

      $DataBegin = fread($fd, 4);

      $DataEnd = fread($fd, 4);

      $ipbegin = implode('', unpack('L', $DataBegin));

      if($ipbegin < 0) $ipbegin += pow(2, 32);

        $ipend = implode('', unpack('L', $DataEnd));

      if($ipend < 0) $ipend += pow(2, 32);

        $ipAllNum = ($ipend - $ipbegin) / 7 + 1;

      $BeginNum = 0;

      $EndNum = $ipAllNum;

      while($ip1num>$ipNum || $ip2num<$ipNum) {

        $Middle= intval(($EndNum + $BeginNum) / 2);

        fseek($fd, $ipbegin + 7 * $Middle);

        $ipData1 = fread($fd, 4);

        if(strlen($ipData1) < 4) {

          fclose($fd);

          return 'System Error';

        }

        $ip1num = implode('', unpack('L', $ipData1));

        if($ip1num < 0) $ip1num += pow(2, 32);   

        if($ip1num > $ipNum) {

          $EndNum = $Middle;

          continue;

        }

        $DataSeek = fread($fd, 3);

        if(strlen($DataSeek) < 3) {

          fclose($fd);

          return 'System Error';

        }

        $DataSeek = implode('', unpack('L', $DataSeek.chr(0)));

        fseek($fd, $DataSeek);

        $ipData2 = fread($fd, 4);

        if(strlen($ipData2) < 4) {

          fclose($fd);

          return 'System Error';

        }

        $ip2num = implode('', unpack('L', $ipData2));

        if($ip2num < 0) $ip2num += pow(2, 32);

          if($ip2num < $ipNum) {

            if($Middle == $BeginNum) {

              fclose($fd);

              return 'Unknown';

            }

            $BeginNum = $Middle;

          }

        }

        $ipFlag = fread($fd, 1);

        if($ipFlag == chr(1)) {

          $ipSeek = fread($fd, 3);

          if(strlen($ipSeek) < 3) {

            fclose($fd);

            return 'System Error';

          }

          $ipSeek = implode('', unpack('L', $ipSeek.chr(0)));

          fseek($fd, $ipSeek);

          $ipFlag = fread($fd, 1);

        }

        if($ipFlag == chr(2)) {

          $AddrSeek = fread($fd, 3);

          if(strlen($AddrSeek) < 3) {

          fclose($fd);

          return 'System Error';

        }

        $ipFlag = fread($fd, 1);

        if($ipFlag == chr(2)) {

          $AddrSeek2 = fread($fd, 3);

          if(strlen($AddrSeek2) < 3) {

            fclose($fd);

            return 'System Error';

          }

          $AddrSeek2 = implode('', unpack('L', $AddrSeek2.chr(0)));

          fseek($fd, $AddrSeek2);

        } else {

          fseek($fd, -1, SEEK_CUR);

        }

        while(($char = fread($fd, 1)) != chr(0))

        $ipAddr2 .= $char;

        $AddrSeek = implode('', unpack('L', $AddrSeek.chr(0)));

        fseek($fd, $AddrSeek);

        while(($char = fread($fd, 1)) != chr(0))

        $ipAddr1 .= $char;

      } else {

        fseek($fd, -1, SEEK_CUR);

        while(($char = fread($fd, 1)) != chr(0))

        $ipAddr1 .= $char;

        $ipFlag = fread($fd, 1);

        if($ipFlag == chr(2)) {

          $AddrSeek2 = fread($fd, 3);

          if(strlen($AddrSeek2) < 3) {

            fclose($fd);

            return 'System Error';

          }

          $AddrSeek2 = implode('', unpack('L', $AddrSeek2.chr(0)));

          fseek($fd, $AddrSeek2);

        } else {

          fseek($fd, -1, SEEK_CUR);

        }

        while(($char = fread($fd, 1)) != chr(0)){

          $ipAddr2 .= $char;

        }

      }

      fclose($fd);

      if(preg_match('/http/i', $ipAddr2)) {

        $ipAddr2 = '';

      }

      $ipaddr = "$ipAddr1 $ipAddr2";

      $ipaddr = preg_replace('/CZ88.NET/is', '', $ipaddr);

      $ipaddr = preg_replace('/^s*/is', '', $ipaddr);

      $ipaddr = preg_replace('/s*$/is', '', $ipaddr);

      if(preg_match('/http/i', $ipaddr) || $ipaddr == '') {

        $ipaddr = 'Unknown';

      }

      return $ipaddr;

    }

convertip(202.96.209.5)

返回的值为：上海市 电信