如何進(jìn)行PHP查詢ip所在地
導(dǎo)語：如何進(jìn)行PHP查詢ip所在地呢?下面是小編給大家提供的實現(xiàn)方法，大家可以參考閱讀，更多詳情請關(guān)注應(yīng)屆畢業(yè)生考試網(wǎng)。
具體實現(xiàn)方法如下：
代碼如下:
<?php
/**
*@ date 2010.12.21
注:文件頭 [第一條索引的偏移量 (4byte)] + [最后一條索引的偏移地址 (4byte)] 8字節(jié)
記錄區(qū) [結(jié)束ip (4byte)] + [地區(qū)1] + [地區(qū)2] 4字節(jié)+不定長
索引區(qū) [開始ip (4byte)] + [指向記錄區(qū)的偏移地址 (3byte)] 7字節(jié)
*/
class iplocation{
var $fp;
var $firstip; /pic/p>
var $lastip; /pic/p>
var $totalip; /pic/p>
/*
|----------------------------------------------------------------------------
| 構(gòu)造函數(shù),初始化一些變量
|----------------------------------------------------------------------------
|
*/
function iplocation($datfile = "qqwry.dat"){
$this->fp=fopen($datfile,'rb')or die("qqwry.dat不存在，請去網(wǎng)上 <a href='/pic/softs/10529.html'>下載純真ip數(shù)據(jù) 庫</a>, 'qqwry.dat' 放到當(dāng)前目錄下"); /pic/p>
$this->firstip = $this->get4b(); /pic/p>
$this->lastip = $this->get4b(); /pic/p>
$this->totalip =($this->lastip - $this->firstip)/7 ; /pic/p>
register_shutdown_function(array($this,"closefp")); /pic/p>
}
/*
|----------------------------------------------------------------------------
| 關(guān)閉ip庫
|----------------------------------------------------------------------------
|
*/
function closefp(){
fclose($this->fp);
}
/*
|----------------------------------------------------------------------------
| 讀取4個字節(jié)并將解壓成long的長模式
|----------------------------------------------------------------------------
|
*/
function get4b(){
$str=unpack("v",fread($this->fp,4));
return $str[1];
}
/*
|----------------------------------------------------------------------------
| 讀取重定向了的偏移地址
|----------------------------------------------------------------------------
|
*/
function getoffset(){
$str=unpack("v",fread($this->fp,3).chr(0));
return $str[1];
}
/*
|----------------------------------------------------------------------------
| 讀取ip的詳細(xì)地址信息
|----------------------------------------------------------------------------
|
*/
function getstr(){
$split=fread($this->fp,1);
while (ord($split)!=0) {
$str .=$split;
$split=fread($this->fp,1);
}
return $str;
}
/*
|----------------------------------------------------------------------------
| 將ip通過ip2long轉(zhuǎn)成ipv4的互聯(lián)網(wǎng)地址,再將他壓縮成big-endian字節(jié)序 ,用來和索引區(qū)內(nèi)的ip地址做比較
|----------------------------------------------------------------------------
|
*/
function iptoint($ip){
return pack("n",intval(ip2long($ip)));
}
/*
|----------------------------------------------------------------------------
| 獲取地址信息
|----------------------------------------------------------------------------
|
*/
function readaddress(){
$now_offset=ftell($this->fp); /pic/p>
$flag=$this->getflag();
switch (ord($flag)){
case 0:
$address="";
break;
case 1:
case 2:
fseek($this->fp,$this->getoffset());
$address=$this->getstr();
break;
default:
fseek($this->fp,$now_offset);
$address=$this->getstr();
break;
}
return $address;
}
/*
|----------------------------------------------------------------------------
| 獲取標(biāo)志1或2 用來確定地址是否重定向了
|----------------------------------------------------------------------------
|
*/
function getflag(){
return fread($this->fp,1);
}
/*
|----------------------------------------------------------------------------
| 用二分查找法在索引區(qū)內(nèi)搜索ip
|----------------------------------------------------------------------------
|
*/
function searchip($ip){
$ip=gethostbyname($ip); /pic/p>
$ip_offset["ip"]=$ip;
$ip=$this->iptoint($ip); /pic/p>
$firstip=0; /pic/p>
$lastip=$this->totalip; /pic/p>
$ipoffset=$this->lastip; /pic/p>
while ($firstip <= $lastip){
$i=floor(($firstip + $lastip) / 2); /pic/p>
fseek($this->fp,$this->firstip + $i * 7); /pic/p>
$startip=strrev(fread($this->fp,4)); /pic/p>
if ($ip < $startip) {
$lastip=$i - 1;
}
else {
fseek($this->fp,$this->getoffset());
$endip=strrev(fread($this->fp,4));
if ($ip > $endip){
$firstip=$i + 1;
}
else {
$ip_offset["offset"]=$this->firstip + $i * 7;
break;
}
}
}
return $ip_offset;
}
/*
|----------------------------------------------------------------------------
| 獲取ip地址詳細(xì)信息
|----------------------------------------------------------------------------
|
*/
function getaddress($ip){
$ip_offset=$this->searchip($ip); /pic/p>
$ipoffset=$ip_offset["offset"];
$address["ip"]=$ip_offset["ip"];
fseek($this->fp,$ipoffset); /pic/p>
$address["startip"]=long2ip($this->get4b()); /pic/p>
$address_offset=$this->getoffset(); /pic/p>
fseek($this->fp,$address_offset); /pic/p>
$address["endip"]=long2ip($this->get4b()); /pic/p>
$flag=$this->getflag(); /pic/p>
switch (ord($flag)) {
case 1: /pic/p>
$address_offset=$this->getoffset(); /pic/p>
fseek($this->fp,$address_offset); /pic/p>
$flag=$this->getflag(); /pic/p>
switch (ord($flag)) {
case 2: /pic/p>
fseek($this->fp,$this->getoffset());
$address["area1"]=$this->getstr();
fseek($this->fp,$address_offset+4); /pic/p>
$address["area2"]=$this->readaddress(); /pic/p>
break;
default: /pic/p>
fseek($this->fp,$address_offset); /pic/p>
$address["area1"]=$this->getstr();
$address["area2"]=$this->readaddress();
break;
}
break;
case 2: /pic/p>
$address1_offset=$this->getoffset(); /pic/p>
fseek($this->fp,$address1_offset);
$address["area1"]=$this->getstr();
fseek($this->fp,$address_offset+8);
$address["area2"]=$this->readaddress();
break;
default: /pic/p>
fseek($this->fp,$address_offset+4);
$address["area1"]=$this->getstr();
$address["area2"]=$this->readaddress();
break;
}
/pic/p>
if (strpos($address["area1"],"cz88.net")!=false){
$address["area1"]="未知";
}
if (strpos($address["area2"],"cz88.net")!=false){
$address["area2"]=" ";
}
return $address;
}
}
/*用法如下:*/
$ip=new iplocation("qqwry.dat");
$address=$ip->getaddress("61.129.51.27");
/pic/p>
echo '<pre>';
print_r($address);
?>
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