php讀取純真ip資料庫使用樣本_PHP教程

複製代碼 代碼如下:
/*--------------------------------------------------
ip2address [qqwry.dat]
--------------------------------------------------*/

class ip {
var $fh; //IP資料庫檔案控制代碼
var $first; //第一條索引
var $last; //最後一條索引
var $total; //索引總數

//建構函式
function __construct() {
$this->fh = fopen('qqwry.dat', 'rb'); //qqwry.dat檔案
$this->first = $this->getLong4();
$this->last = $this->getLong4();
$this->total = ($this->last - $this->first) / 7; //每條索引7位元組
}

//檢查IP合法性
function checkIp($ip) {
$arr = explode('.',$ip);
if(count($arr) !=4 ) {
return false;
} else {
for ($i=0; $i < 4; $i++) {
if ($arr[$i] <'0' || $arr[$i] > '255') {
return false;
}
}
}
return true;
}

function getLong4() {
//讀取little-endian編碼的4個位元組轉化為長整型數
$result = unpack('Vlong', fread($this->fh, 4));
return $result['long'];
}

function getLong3() {
//讀取little-endian編碼的3個位元組轉化為長整型數
$result = unpack('Vlong', fread($this->fh, 3).chr(0));
return $result['long'];
}

//查詢資訊
function getInfo($data = "") {
$char = fread($this->fh, 1);
while (ord($char) != 0) { //國家地區資訊以0結束
$data .= $char;
$char = fread($this->fh, 1);
}
return $data;
}

//查詢地區資訊
function getArea() {
$byte = fread($this->fh, 1); //標誌位元組
switch (ord($byte)) {
case 0: $area = ''; break; //沒有地區資訊
case 1: //地區被重新導向
fseek($this->fh, $this->getLong3());
$area = $this->getInfo(); break;
case 2: //地區被重新導向
fseek($this->fh, $this->getLong3());
$area = $this->getInfo(); break;
default: $area = $this->getInfo($byte); break; //地區沒有被重新導向
}
return $area;
}

function ip2addr($ip) {
if(!$this -> checkIp($ip)){
return false;
}

$ip = pack('N', intval(ip2long($ip)));

//二分尋找
$l = 0;
$r = $this->total;

while($l <= $r) {
$m = floor(($l + $r) / 2); //計算中間索引
fseek($this->fh, $this->first + $m * 7);
$beginip = strrev(fread($this->fh, 4)); //中間索引的開始IP地址
fseek($this->fh, $this->getLong3());
$endip = strrev(fread($this->fh, 4)); //中間索引的結束IP地址

if ($ip < $beginip) { //使用者的IP小於中間索引的開始IP地址時
$r = $m - 1;
} else {
if ($ip > $endip) { //使用者的IP大於中間索引的結束IP地址時
$l = $m + 1;
} else { //使用者IP在中間索引的IP範圍內時
$findip = $this->first + $m * 7;
break;
}
}
}

//查詢國家地區資訊
fseek($this->fh, $findip);
$location['beginip'] = long2ip($this->getLong4()); //使用者IP所在範圍的開始地址
$offset = $this->getlong3();
fseek($this->fh, $offset);
$location['endip'] = long2ip($this->getLong4()); //使用者IP所在範圍的結束位址
$byte = fread($this->fh, 1); //標誌位元組
switch (ord($byte)) {
case 1: //國家和地區資訊都被重新導向
$countryOffset = $this->getLong3(); //重新導向地址
fseek($this->fh, $countryOffset);
$byte = fread($this->fh, 1); //標誌位元組
switch (ord($byte)) {
case 2: //國家資訊被二次重新導向
fseek($this->fh, $this->getLong3());
$location['country'] = $this->getInfo();
fseek($this->fh, $countryOffset + 4);
$location['area'] = $this->getArea();
break;
default: //國家資訊沒有被二次重新導向
$location['country'] = $this->getInfo($byte);
$location['area'] = $this->getArea();
break;
}
break;

case 2: //國家資訊被重新導向
fseek($this->fh, $this->getLong3());
$location['country'] = $this->getInfo();
fseek($this->fh, $offset + 8);
$location['area'] = $this->getArea();
break;

default: //國家資訊沒有被重新導向
$location['country'] = $this->getInfo($byte);
$location['area'] = $this->getArea();
break;
}

//gb2312 to utf-8（去除無資訊時顯示的CZ88.NET）
foreach ($location as $k => $v) {
$location[$k] = str_replace('CZ88.NET','',iconv('gb2312', 'utf-8', $v));
}

return $location;
}

//解構函式
function __destruct() {
fclose($this->fh);
}
}

$ip = new ip();
$addr = $ip -> ip2addr('IP地址');
print_r($addr);
?>

http://www.bkjia.com/PHPjc/728115.htmlwww.bkjia.comtruehttp://www.bkjia.com/PHPjc/728115.htmlTechArticle複製代碼 代碼如下: ?php /*-------------------------------------------------- ip2address [qqwry.dat] --------------------------------------------------*/ class ip { var $fh;...

