php查询IP地理位置（dat数据库）-纯真IP数据库

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 &#39;&#39;;
		
		@fseek($this->fp, $offset, SEEK_SET);

		return $this->getStr();
	}

	function getStr()
	{
		$str = &#39;&#39;;
		
		while(1)
		{
			$c = fgetc($this->fp);

			if(ord($c[0]) == 0) break;
			
			$str .= $c;
		}
		
		return $str;
	}

	function QQwry($dotip = &#39;&#39;)
	{
		if(!$dotip) return;
		
		if(ereg("^(127)", $dotip))
		{
			$this->Country = &#39;本地网络&#39;;
			return;
		}
		else if(ereg("^(192)", $dotip))
		{
			$this->Country = &#39;局域网&#39;;
			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 = &#39;未知&#39;;
			$this->Local = &#39;&#39;;
		}
		
		fclose($this->fp);
	}

	function IpToInt($Ip)
	{
		$array = explode(&#39;.&#39;, $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
*/