php IP Get City API (Innocent IP Database)-PHP Tutorial-php.cn

php IP Get City API (Innocent IP Database)

WBOY

Release： 2016-07-25 08:55:58

Original

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/**
* Get city name based on IP address Innocence IP database
* edit: bbs.it-home.org
*/
function convertip($ip) {
//IP data file path
$dat_path = 'QQWry.Dat';
//Check IP address
if(!filter_var($ip, FILTER_VALIDATE_IP)) {
return 'IP Address Error';
}
//Open IP data file
if(!$fd = @fopen($dat_path, 'rb')){
return 'IP date file not exists or access denied';
}
//Decompose the IP for operation and get an integer number
$ipNum = ip2long($ip);
//Get the start and end position of the IP data index
$DataBegin = fread($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 = $ipAllNum; //Use binary search method to search for matching IP records from the index records while($ip1num>$ ipNum || $ip2num<$ipNum) {
$Middle= intval(($EndNum + $BeginNum) / 2);
//Offset the pointer to the index position and read 4 bytes
fseek($fd, $ ipbegin + 7 * $Middle);
$ipData1 = fread($fd, 4);
if(strlen($ipData1) < 4) {
fclose($fd);
return 'System Error';
}
//The extracted data is converted into a long integer. If the data is a negative number, add 2 to the 32nd power
$ip1num = implode('', unpack('L', $ipData1));
if($ip1num < 0 ) $ip1num += pow(2, 32); //If the extracted long integer is greater than our IP address, modify the end position for the next cycle if($ip1num > $ipNum) {
$EndNum = $Middle;
continue;
}
//Get the next index after fetching the previous index
$DataSeek = fread($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) $ip2num += pow(2, 32);
//Unknown prompt not found
if($ip2num < $ipNum) {
if($Middle = = $BeginNum) {
fclose($fd);
return 'Unknown';
}
$BeginNum = $Middle;
}
}
//The following code is confusing to read. I don’t understand it. I’m interested. Slow reading
$ipFlag = fread($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);
//最后做相应的替换操作后返回结果
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;
}
header("Content-type: text/html; charset=utf-8");
$ip = $_SERVER['HTTP_X_FORWARDED_FOR'];
if(isset($_GET['q'])){
$ip = $_GET['q'];
if(filter_var("http://".$ip,FILTER_VALIDATE_URL,FILTER_FLAG_HOST_REQUIRED)){
$ip = gethostbyname($ip);
}
}
echo "$ip,".mb_convert_encoding(convertip($ip),"utf-8","gb2312");
?>