看到有人分享了一个，那就分享个经典的利用纯真IP数据库查询吧，相信有很多人都见过甚至用过了这个代码。不过可能不知道，这个代码其实是从一个PECL的C++代码改过来的。PHP代码/*++++++++++++++++++++++++++++++++++++

程序名称：IP解析程序

程序功能：基于QQ的二进制数据库QQWry.Dat

程序作者：strongc

使用方法：

请将文件 QQWry.Dat 置于当前目录中

或者可以用修改

define('__QQWRY__' , dirname(__FILE__).".\QQWry.Dat");

语句自定义QQWry.Dat路径

#实例+++++++++++++++++++++++++++++++

$ip="202.201.48.1";

$QQWry=new QQWry;

$ifErr=$QQWry->QQWry($ip);

echo "$QQWry->Country$QQWry->Local";

+++++++++++++++++++++++++++++++++++++*/

define('__QQWRY__' , dirname(__FILE__).".\QQWry.Dat");

class QQWry

{

var $StartIP = 0;

var $EndIP = 0;

var $Country = '';

var $Local = '';

var $CountryFlag = 0; // 标识 Country位置

// 0x01,随后3字节为Country偏移,没有Local

// 0x02,随后3字节为Country偏移,接着是Local

// 其他,Country,Local,Local有类似的压缩。可能多重引用。

var $fp;

var $FirstStartIp = 0;

var $LastStartIp = 0;

var $EndIpOff = 0;

function getStartIp($RecNo)

{

$offset = $this->FirstStartIp + $RecNo * 7;

@fseek($this->fp, $offset, SEEK_SET);

$buf = fread($this->fp, 7);

$this->EndIpOff = ord($buf[4]) + (ord($buf[5]) * 256) + (ord($buf[6]) * 256 * 256);

$this->StartIp = ord($buf[0]) + (ord($buf[1]) * 256) + (ord($buf[2]) * 256 * 256) + (ord($buf[3]) * 256 * 256 * 256);

return $this->StartIp;

}

function getEndIp()

{

@fseek($this->fp, $this->EndIpOff, SEEK_SET);

$buf = fread($this->fp, 5);

$this->EndIp = ord($buf[0]) + (ord($buf[1]) * 256) + (ord($buf[2]) * 256 * 256) + (ord($buf[3]) * 256 * 256 * 256);

$this->CountryFlag = ord($buf[4]);

return $this->EndIp;

}

function getCountry()

{

switch($this->CountryFlag)

{

case 1:

case 2:

$this->Country = $this->getFlagStr($this->EndIpOff + 4);

$this->Local = (1 == $this->CountryFlag) ? '' : $this->getFlagStr($this->EndIpOff + 8);

break ;

default:

$this->Country = $this->getFlagStr($this->EndIpOff + 4);

$this->Local = $this->getFlagStr(ftell($this->fp));

}

}

function getFlagStr($offset)

{

$flag = 0;

while(1)

{

@fseek($this->fp, $offset, SEEK_SET);

$flag = ord(fgetc($this->fp));

if($flag == 1 || $flag == 2)

{

$buf = fread($this->fp, 3);

if($flag == 2)

{

$this->CountryFlag = 2;

$this->EndIpOff = $offset - 4;

}

$offset = ord($buf[0]) + (ord($buf[1]) * 256) + (ord($buf[2]) * 256 * 256);

}

else

break;

}

if($offset < 12) return '';

@fseek($this->fp, $offset, SEEK_SET);

return $this->getStr();

}

function getStr()

{

$str = '';

while(1)

{

$c = fgetc($this->fp);

if(ord($c[0]) == 0) break;

$str .= $c;

}

return $str;

}

function QQwry($dotip = '')

{

if(!$dotip) return;

if(ereg("^(127)", $dotip))

{

$this->Country = '本地网络';

return;

}

else if(ereg("^(192)", $dotip))

{

$this->Country = '局域网';

return;

}

$nRet;

$ip = $this->IpToInt($dotip);

$this->fp = fopen(__QQWRY__, "rb");

if($this->fp == NULL)

{

$szLocal = "OpenFileError";

return 1;

}

@fseek($this->fp, 0, SEEK_SET);

$buf = fread($this->fp, 8);

$this->FirstStartIp = ord($buf[0]) + (ord($buf[1]) * 256) + (ord($buf[2]) * 256 * 256) + (ord($buf[3]) * 256 * 256 * 256);

$this->LastStartIp = ord($buf[4]) + (ord($buf[5]) * 256) + (ord($buf[6]) * 256 * 256) + (ord($buf[7]) * 256 * 256 * 256);

$RecordCount = floor(($this->LastStartIp - $this->FirstStartIp) / 7);

if($RecordCount Country = "FileDataError";

fclose($this->fp) ;

return 2 ;

}

$RangB = 0;

$RangE = $RecordCount;

// Match ...

while($RangB < $RangE - 1)

{

$RecNo = floor(($RangB + $RangE) / 2);

$this->getStartIp($RecNo) ;

if($ip == $this->StartIp)

{

$RangB = $RecNo;

break;

}

if($ip > $this->StartIp) $RangB = $RecNo;

else $RangE = $RecNo;

}

$this->getStartIp($RangB);

$this->getEndIp();

if(($this->StartIp EndIp >= $ip))

{

$this->getCountry();

}

else

{

$this->Country = '未知';

$this->Local = '';

}

fclose($this->fp);

}

function IpToInt($Ip)

{

$array = explode('.', $Ip);

$Int = ($array[0] * 256 * 256 * 256) + ($array[1] * 256 * 256) + ($array[2] * 256) + $array[3];

return $Int;

}

}

2.[代码][PHP]代码$ip = "202.201.48.1";

$QQWry = new QQWry;

$ifErr = $QQWry->QQWry($ip);

echo $ip . "$QQWry->Country$QQWry->Local\n";

/*

结果：

202.201.48.1甘肃省兰州市西北师范大学

*/

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