Simple example of php reading innocent ip database

/*----------------------------------------- ----------
 ip2address [qqwry.dat]
--------------------------------- --------------------*/
class ip {
 var $fh; //IP database file handle
 var $first; //First index
 var $last; //The last index
 var $total; //Total indexes
 //Constructor function
 function __construct() {
 $this->fh = fopen('qqwry.dat', 'rb'); / /qqwry.dat file
 $this->first = $this->getLong4();
 $this->last = $this->getLong4();
 $this->total = ($this ->last - $this->first) / 7; //Each index is 7 bytes
 }
 //Check the legality of the IP
 function checkIp($ip) {
 $arr = explode('.', $ip);
 if(count($arr) !=4 ) {
 return false;
 } else {
 for ($i=0; $i  if ($arr[$ i]  '255') {
 return false;
 }
 }
 }
 return true;
 }
 function getLong4() {
 //Read little -Convert 4 bytes of endian encoding to long integer
 $result = unpack('Vlong', fread($this->fh, 4));
 return $result['long'];
 }
 function getLong3() {
 //Read the 3 bytes of little-endian encoding and convert it into a long integer
 $result = unpack('Vlong', fread($this->fh, 3).chr(0 ));
 return $result['long'];
 }
 //Query information
 function getInfo($data = "") {
 $char = fread($this->fh, 1);
 while ( ord($char) != 0) { //Country and region information ends with 0
 $data .= $char;
 $char = fread($this->fh, 1);
 }
 return $data;
 } bbs.it-home.org
 //Query area information
 function getArea() {
 $byte = fread($this->fh, 1); //Flag byte
 switch (ord($byte)) {
 case 0: $area = ''; break; //There is no area information
 case 1: //The area is redirected
 fseek($this->fh, $this->getLong3());
 $ area = $this->getInfo(); break;
 case 2: //Area is redirected
 fseek($this->fh, $this->getLong3());
 $area = $this- >getInfo(); break;
 default: $area = $this->getInfo($byte); break; //The area is not redirected
 }
 return $area;
 }
 function ip2addr($ip) {
 if(!$this -> checkIp($ip)){
 return false;
 }
 $ip = pack('N', intval(ip2long($ip)));
 //Binary search
 $ l = 0;
 $r = $this->total;
 while($l  $m = floor(($l + $r) / 2); //Calculate the intermediate index
 fseek($this->fh, $this->first + $m * 7);
 $beginip = strrev(fread($this->fh, 4)); //The starting IP address of the intermediate index
 fseek($this->fh, $this->getLong3());
 $endip = strrev(fread($this->fh, 4)); //End IP address of the intermediate index
 if ($ ip  $r = $m - 1;
 } else {
 if ($ip > $endip) { //The user's IP is greater than When the ending IP address of the intermediate index is
 $l = $m + 1;
 } else { //When the user IP is within the IP range of the intermediate index
 $findip = $this->first + $m * 7;
 break ;
 }
 }
 }
 //Query country and region information
 fseek($this->fh, $findip);
 $location['beginip'] = long2ip($this->getLong4()); / /Start address of the user IP range
 $offset = $this->getlong3();
 fseek($this->fh, $offset);
 $location['endip'] = long2ip($this-> ;getLong4()); //End address of the user IP range
 $byte = fread($this->fh, 1); //Flag byte
 switch (ord($byte)) {
 case 1: //Both country and region information are redirected
 $countryOffset = $this->getLong3(); //Redirect address
 fseek($this->fh, $countryOffset);
 $byte = fread($this ->fh, 1); //Flag byte
 switch (ord($byte)) {
 case 2: //Country information is redirected twice
 fseek($this->fh, $this-> ;getLong3());
 $location['country'] = $this->getInfo();
 fseek($this->fh, $countryOffset + 4);
 $location['area'] = $ this->getArea();
 break;
 default: //Country information is not redirected twice
 $location['country'] = $this->getInfo($byte);
 $location['area '] = $this->getArea();
 break;
 }
 break;
 case 2: //Country information is redirected
 fseek($this->fh, $this->getLong3()) ;
 $location['country'] = $this->getInfo();
 fseek($this->fh, $offset + 8);
 $location['area'] = $this->getArea ();
 break;
 default: //Country information is not redirected
 $location['country'] = $this->getInfo($byte);
 $location['area'] = $this-> ;getArea();
 break;
 }
 //gb2312 to utf-8 (remove CZ88.NET displayed when there is no information)
 foreach ($location as $k => $v) {
 $location[$k] = str_replace('CZ88.NET', '',iconv('gb2312', 'utf-8', $v));
 }
 return $location;
 }
 //Destructor
 function __destruct() {
 fclose($this->fh );
 }
}
$ip = new ip();
$addr = $ip -> ip2addr('IP address');
print_r($addr);
?>