PHP determines IP location source code_PHP tutorial

The code below is used to determine the user's city based on the IP. The source code for php to determine the IP location is completely open.

The code below is used to determine the city based on the IP. The source code for php to determine the IP location is completely open. Call

function convertIp($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 {
$ipfile = MOOPHP_ROOT.' /plugins/ipdata/wry.dat';
if(!@file_exists($ipfile)) {
$return = convertIpFull($ip, $ipfile);
}
}
}
return $return;
}

function convertIpFull($ip, $ipdatafile) {

if(!$fd = @fopen($ipdatafile)) {
return '- Invalid IP data file';
}

$ip = explode('.', $ip);
$ipNum = $ip[0] * 16777216 + $ip[ 1] * 65536 + $ip[2] * 256 + $ip[3];

if(!($DataBegin = fread($fd, 4)) || !($DataEnd = fread($ fd, 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($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;

}