显IP功能（二）

类文件：ipLocation.class.php

/*<br /> * $Id: ipLocation.class.php v0.0.1 2008-11-4 Linvo $<br /> * $author: www.phperz.com<br /> * Copyright(C) 2008<br /> */<br /> class ipLocation {<br /> var $fp;<br /> var $firstip; //第一条ip索引的偏移地址<br /> var $lastip; //最后一条ip索引的偏移地址<br /> var $totalip; //总ip数 </p> <p> //*<br /> //构造函数,初始化一些变量<br /> //$datfile 的值为纯真IP数据库的名子,可自行修改.<br /> //*<br /> function ipLocation($datfile = 'IPdb.Dat')<br /> {<br /> $this->fp = fopen($datfile,'rb'); //二制方式打开<br /> $this->firstip = $this->get4b(); //第一条ip索引的绝对偏移地址<br /> $this->lastip = $this->get4b(); //最后一条ip索引的绝对偏移地址<br /> $this->totalip = ($this->lastip - $this->firstip)/7 ; //ip总数 索引区是定长的7个字节,在此要除以7,<br /> register_shutdown_function(array($this,'closefp')); //为了兼容php5以下版本,本类没有用析构函数,自动关闭ip库.<br /> } </p> <p> //*<br /> //关闭ip库<br /> //*<br /> function closefp()<br /> {<br /> fclose($this->fp);<br /> } </p> <p> //*<br /> //读取4个字节并将解压成long的长模式<br /> //*<br /> function get4b()<br /> {<br /> $str = unpack('V', fread($this->fp, 4));<br /> return $str[1];<br /> } </p> <p> //*<br /> //读取重定向了的偏移地址<br /> //*<br /> function getoffset()<br /> {<br /> $str = unpack('V', fread($this->fp, 3).chr(0));<br /> return $str[1];<br /> } </p> <p> //*<br /> //读取ip的详细地址信息<br /> //*<br /> function getstr()<br /> {<br /> $split = fread($this->fp, 1);<br /> while(ord($split) != 0)<br /> {<br /> $str .= $split;<br /> $split = fread($this->fp,1);<br /> }<br /> return $str;<br /> } </p> <p> //*<br /> //将ip通过ip2long转成ipv4的互联网地址,再将他压缩成big-endian字节序<br /> //用来和索引区内的ip地址做比较<br /> //*<br /> function iptoint($ip)<br /> {<br /> return pack('N', intval(ip2long($ip)));<br /> } </p> <p> //*<br /> //获取地址信息<br /> //*<br /> function readaddress()<br /> {<br /> $now_offset = ftell($this->fp); //得到当前的指针位址<br /> $flag = $this->getflag();<br /> switch(ord($flag))<br /> {<br /> case 0:<br /> $address = '';<br /> break;<br /> case 1:<br /> case 2:<br /> fseek($this->fp, $this->getoffset());<br /> $address = $this->getstr();<br /> break;<br /> default:<br /> fseek($this->fp, $now_offset);<br /> $address = $this->getstr();<br /> break;<br /> }<br /> return $address;<br /> } </p> <p> //*<br /> //获取标志1或2<br /> //用来确定地址是否重定向了.<br /> //*<br /> function getflag()<br /> {<br /> return fread($this->fp, 1);<br /> } </p> <p> //*<br /> //用二分查找法在索引区内搜索ip<br /> //*<br /> function searchip($ip)<br /> {<br /> $ip = gethostbyname($ip); //将域名转成ip<br /> $ip_offset['ip'] = $ip;<br /> $ip = $this->iptoint($ip); //将ip转换成长整型<br /> $firstip = 0; //搜索的上边界<br /> $lastip = $this->totalip; //搜索的下边界<br /> $ipoffset = $this->lastip; //初始化为最后一条ip地址的偏移地址<br /> while($firstip <= $lastip)<br /> {<br /> $i = floor(($firstip + $lastip) / 2); //计算近似中间记录 floor函数记算给定浮点数小的最大整数,说白了就是四舍五也舍<br /> fseek($this->fp, $this->firstip + $i * 7); //定位指针到中间记录<br /> $startip = strrev(fread($this->fp, 4)); //读取当前索引区内的开始ip地址,并将其little-endian的字节序转换成big-endian的字节序 php程序员站<br /> if($ip < $startip)<br /> {<br /> $lastip = $i - 1;<br /> }else{<br /> fseek($this->fp, $this->getoffset());<br /> $endip = strrev(fread($this->fp, 4));<br /> if ($ip > $endip){<br /> $firstip = $i + 1;<br /> }else{<br /> $ip_offset['offset'] = $this->firstip + $i * 7;<br /> break;<br /> }<br /> }<br /> }<br /> return $ip_offset;<br /> } </p> <p> //*<br /> //获取ip地址详细信息<br /> //*<br /> function getaddress($ip)<br /> {<br /> $ip_offset = $this->searchip($ip); //获取ip 在索引区内的绝对编移地址<br /> $ipoffset = $ip_offset['offset'];<br /> $address['ip'] = $ip_offset['ip'];<br /> fseek($this->fp, $ipoffset); //定位到索引区<br /> $address['startip'] = long2ip($this->get4b()); //索引区内的开始ip 地址<br /> $address_offset = $this->getoffset(); //获取索引区内ip在ip记录区内的偏移地址<br /> fseek($this->fp, $address_offset); //定位到记录区内<br /> $address['endip'] = long2ip($this->get4b()); //记录区内的结束ip 地址<br /> $flag = $this->getflag(); //读取标志字节<br /> switch(ord($flag))<br /> {<br /> case 1: //地区1地区2都重定向<br /> $address_offset = $this->getoffset(); //读取重定向地址<br /> fseek($this->fp, $address_offset); //定位指针到重定向的地址<br /> $flag = $this->getflag(); //读取标志字节<br /> switch(ord($flag))<br /> {<br /> case 2: //地区1又一次重定向,<br /> fseek($this->fp, $this->getoffset());<br /> $address['area1'] = $this->getstr();<br /> fseek($this->fp, $address_offset+4); //跳4个字节<br /> $address['area2'] = $this->readaddress(); //地区2有可能重定向,有可能没有<br /> break;<br /> default: //地区1,地区2都没有重定向<br /> fseek($this->fp, $address_offset); //定位指针到重定向的地址<br /> $address['area1'] = $this->getstr();<br /> $address['area2'] = $this->readaddress();<br /> break;<br /> }<br /> break;<br /> case 2: //地区1重定向 地区2没有重定向<br /> $address1_offset = $this->getoffset(); //读取重定向地址<br /> fseek($this->fp, $address1_offset);<br /> $address['area1'] = $this->getstr();<br /> fseek($this->fp, $address_offset+8);<br /> $address['area2'] = $this->readaddress();<br /> break;<br /> default: //地区1地区2都没有重定向<br /> fseek($this->fp, $address_offset+4);<br /> $address['area1'] = $this->getstr();<br /> $address['area2'] = $this->readaddress();<br /> break;<br /> } </p> <p> //*过滤一些无用数据<br /> if(strpos($address['area1'], 'CZ88.NET') != false) $address['area1'] = '未知';<br /> if(strpos($address['area2'], 'CZ88.NET') != false) $address['area2'] = ' ';<br /> return $address;<br /> } </p> <p>}<br /> 调用测试文件：test.php</p> <p>PHP代码<br /> header("content-type:text/html;charset=utf-8"); </p> <p>include 'ipLocation.class.php'; //载入类 </p> <p>$ip_1 = '218.198.33.3';<br /> $ip_2 = '127.0.0.1'; </p> <p>$myobj =new ipLocation(); </p> <p>$address = $myobj->getaddress($ip_1);<br /> echo iconv('gb2312','utf-8',$address['area1'].' '.$address['area2']).'<br />';<br /> //输出：河南省郑州市 郑州大学升达经贸管理学院 </p> <p>$address = $myobj->getaddress($ip_2);<br /> echo iconv('gb2312','utf-8',$address['area1'].' '.$address['area2']).'<br />';<br /> //输出：本机地址

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原文链接：显IP功能（二），转载请注明来源！