如何进行PHP查询ip所在地
导语：如何进行PHP查询ip所在地呢?下面是小编给大家提供的实现方法，大家可以参考阅读，更多详情请关注应届毕业生考试网。
具体实现方法如下：
代码如下:
<?php
/**
*@ date 2010.12.21
注:文件头 [第一条索引的偏移量 (4byte)] + [最后一条索引的偏移地址 (4byte)] 8字节
记录区 [结束ip (4byte)] + [地区1] + [地区2] 4字节+不定长
索引区 [开始ip (4byte)] + [指向记录区的偏移地址 (3byte)] 7字节
*/
class iplocation{
var $fp;
var $firstip; /pic/p>
var $lastip; /pic/p>
var $totalip; /pic/p>
/*
|----------------------------------------------------------------------------
| 构造函数,初始化一些变量
|----------------------------------------------------------------------------
|
*/
function iplocation($datfile = "qqwry.dat"){
$this->fp=fopen($datfile,'rb')or die("qqwry.dat不存在，请去网上 <a href='/pic/softs/10529.html'>下载纯真ip数据 库</a>, 'qqwry.dat' 放到当前目录下"); /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>
}
/*
|----------------------------------------------------------------------------
| 关闭ip库
|----------------------------------------------------------------------------
|
*/
function closefp(){
fclose($this->fp);
}
/*
|----------------------------------------------------------------------------
| 读取4个字节并将解压成long的长模式
|----------------------------------------------------------------------------
|
*/
function get4b(){
$str=unpack("v",fread($this->fp,4));
return $str[1];
}
/*
|----------------------------------------------------------------------------
| 读取重定向了的偏移地址
|----------------------------------------------------------------------------
|
*/
function getoffset(){
$str=unpack("v",fread($this->fp,3).chr(0));
return $str[1];
}
/*
|----------------------------------------------------------------------------
| 读取ip的详细地址信息
|----------------------------------------------------------------------------
|
*/
function getstr(){
$split=fread($this->fp,1);
while (ord($split)!=0) {
$str .=$split;
$split=fread($this->fp,1);
}
return $str;
}
/*
|----------------------------------------------------------------------------
| 将ip通过ip2long转成ipv4的互联网地址,再将他压缩成big-endian字节序 ,用来和索引区内的ip地址做比较
|----------------------------------------------------------------------------
|
*/
function iptoint($ip){
return pack("n",intval(ip2long($ip)));
}
/*
|----------------------------------------------------------------------------
| 获取地址信息
|----------------------------------------------------------------------------
|
*/
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 $address;
}
/*
|----------------------------------------------------------------------------
| 获取标志1或2 用来确定地址是否重定向了
|----------------------------------------------------------------------------
|
*/
function getflag(){
return fread($this->fp,1);
}
/*
|----------------------------------------------------------------------------
| 用二分查找法在索引区内搜索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 $ip_offset;
}
/*
|----------------------------------------------------------------------------
| 获取ip地址详细信息
|----------------------------------------------------------------------------
|
*/
function getaddress($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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