php 根据IP显示地区代码

define('IPDATA_MINI', PHPCMS_ROOT.'include/ipdata/mini.Dat');
define('IPDATA_FULL', PHPCMS_ROOT.'include/ipdata/QQWry.Dat');

class ip_area
{
 var $fp = NULL;
 var $func;
 var $offset;
 var $index;

 function ip_area()
 {
  if(@file_exists(IPDATA_MINI))
  {
   $this->func = 'data_mini';
   $this->fp = @fopen(IPDATA_MINI, 'rb');
   $this->offset = unpack('Nlen', fread($this->fp, 4));
   $this->index  = fread($this->fp, $this->offset['len'] - 4);
  }
  elseif(@file_exists(IPDATA_FULL))
  {
   $this->func = 'data_full';
   $this->fp = @fopen(IPDATA_FULL, 'rb');
  }
 }

 function get($ip)
 {
  $return = '';
  if(preg_match("/^d{1,3}.d{1,3}.d{1,3}.d{1,3}$/", $ip))
  {
   $iparray = explode('.', $ip);
   if($iparray[0] == 10 || $iparray[0] == 127 || ($iparray[0] == 192 && $iparray[1] == 168) || ($iparray[0] == 172 && ($iparray[1] >= 16 && $iparray[1] <= 31)))
   {
    $return = 'LAN';
   }
   elseif($iparray[0] > 255 || $iparray[1] > 255 || $iparray[2] > 255 || $iparray[3] > 255)
   {
    $return = 'Invalid IP Address';
   }
   else
   {
    $return = $this->func ? $this->{$this->func}($ip) : '';
    if(strpos($return, ' ') !== false) $return = substr($return, 0, strpos($return,' '));
   }
   if(strtolower(CHARSET) == 'utf-8') $return = iconv('gbk', 'utf-8', $return);
  }
  return $return;
 }

 function data_mini($ip)
 {
  $ipdot = explode('.', $ip);
  $ipdot[0] = (int)$ipdot[0];
  $ipdot[1] = (int)$ipdot[1];
  $ip    = pack('N', ip2long($ip));
  $length = $this->offset['len'] - 1028;
  $start  = unpack('Vlen', $this->index[$ipdot[0] * 4] . $this->index[$ipdot[0] * 4 + 1] . $this->index[$ipdot[0] * 4 + 2] . $this->index[$ipdot[0] * 4 + 3]);
  for($start = $start['len'] * 8 + 1024; $start < $length; $start += 8)
  {
   if($this->index{$start} . $this->index{$start + 1} . $this->index{$start + 2} . $this->index{$start + 3} >= $ip)
   {
    $this->index_offset = unpack('Vlen', $this->index{$start + 4} . $this->index{$start + 5} . $this->index{$start + 6} . "x0");
    $this->index_length = unpack('Clen', $this->index{$start + 7});
    break;
   }
  }
  fseek($this->fp, $this->offset['len'] + $this->index_offset['len'] - 1024);
  if($this->index_length['len'])
  {
   return str_replace('- ', '', fread($this->fp, $this->index_length['len']));
  }
  else
  {
   return 'Unknown';
  }
 }

 function data_full($ip)
 {
  rewind($this->fp);
  $ip = explode('.', $ip);
  $ipNum = $ip[0] * 16777216 + $ip[1] * 65536 + $ip[2] * 256 + $ip[3];
  if(!($DataBegin = fread($this->fp, 4)) || !($DataEnd = fread($this->fp, 4)) ) return;
  @$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 = $ip2num = $ip1num = 0;
  $ipAddr1 = $ipAddr2 = '';
  $EndNum = $ipAllNum;
  while($ip1num > $ipNum || $ip2num < $ipNum)
  {
   $Middle= intval(($EndNum + $BeginNum) / 2);
   fseek($this->fp, $ipbegin + 7 * $Middle);
   $ipData1 = fread($this->fp, 4);
   if(strlen($ipData1) < 4)
   {
    fclose($this->fp);
    return 'System Error';
   }
   $ip1num = implode('', unpack('L', $ipData1));
   if($ip1num < 0) $ip1num += pow(2, 32);
   if($ip1num > $ipNum)
   {
    $EndNum = $Middle;
    continue;
   }
   $DataSeek = fread($this->fp, 3);
   if(strlen($DataSeek) < 3)
   {
    fclose($this->fp);
    return 'System Error';
   }
   $DataSeek = implode('', unpack('L', $DataSeek.chr(0)));
   fseek($this->fp, $DataSeek);
   $ipData2 = fread($this->fp, 4);
   if(strlen($ipData2) < 4)
   {
    fclose($this->fp);
    return 'System Error';
   }
   $ip2num = implode('', unpack('L', $ipData2));
   if($ip2num < 0) $ip2num += pow(2, 32);
   if($ip2num < $ipNum)
   {
    if($Middle == $BeginNum)
    {
     fclose($this->fp);
     return 'Unknown';
    }
    $BeginNum = $Middle;
   }
  }
  $ipFlag = fread($this->fp, 1);
  if($ipFlag == chr(1))
  {
   $ipSeek = fread($this->fp, 3);
   if(strlen($ipSeek) < 3)
   {
    fclose($this->fp);
    return 'System Error';
   }
   $ipSeek = implode('', unpack('L', $ipSeek.chr(0)));
   fseek($this->fp, $ipSeek);
   $ipFlag = fread($this->fp, 1);
  }
  if($ipFlag == chr(2))
  {
   $AddrSeek = fread($this->fp, 3);
   if(strlen($AddrSeek) < 3)
   {
    fclose($this->fp);
    return 'System Error';
   }
   $ipFlag = fread($this->fp, 1);
   if($ipFlag == chr(2)) {
    $AddrSeek2 = fread($this->fp, 3);
    if(strlen($AddrSeek2) < 3)
    {
     fclose($this->fp);
     return 'System Error';
    }
    $AddrSeek2 = implode('', unpack('L', $AddrSeek2.chr(0)));
    fseek($this->fp, $AddrSeek2);
   }
   else
   {
    fseek($this->fp, -1, SEEK_CUR);
   }
   while(($char = fread($this->fp, 1)) != chr(0))
   $ipAddr2 .= $char;
   $AddrSeek = implode('', unpack('L', $AddrSeek.chr(0)));
   fseek($this->fp, $AddrSeek);
   while(($char = fread($this->fp, 1)) != chr(0))
   $ipAddr1 .= $char;
  }
  else
  {
   fseek($this->fp, -1, SEEK_CUR);
   while(($char = fread($this->fp, 1)) != chr(0))
   $ipAddr1 .= $char;
   $ipFlag = fread($this->fp, 1);
   if($ipFlag == chr(2))
   {
    $AddrSeek2 = fread($this->fp, 3);
    if(strlen($AddrSeek2) < 3)
    {
     fclose($this->fp);
     return 'System Error';
    }
    $AddrSeek2 = implode('', unpack('L', $AddrSeek2.chr(0)));
    fseek($this->fp, $AddrSeek2);
   }
   else
   {
    fseek($this->fp, -1, SEEK_CUR);
   }
   while(($char = fread($this->fp, 1)) != chr(0))
   $ipAddr2 .= $char;
  }
  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;
 }

 function close()
 {
  @fclose($this->fp);
 }
}
?>