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<?php
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namespace com;
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// +----------------------------------------------------------------------
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// | ThinkPHP [ WE CAN DO IT JUST THINK IT ]
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// +----------------------------------------------------------------------
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// | Copyright (c) 2009 http://thinkphp.cn All rights reserved.
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// +----------------------------------------------------------------------
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// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
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// +----------------------------------------------------------------------
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// | Author: liu21st <liu21st@gmail.com>
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// +----------------------------------------------------------------------
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/**
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* IP 地理位置查询类 修改自 CoolCode.CN
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* 由于使用UTF8编码 如果使用纯真IP地址库的话 需要对返回结果进行编码转换
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* @author liu21st <liu21st@gmail.com>
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*/
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class IpLocation {
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/**
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* QQWry.Dat文件指针
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*
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* @var resource
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*/
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private $fp;
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/**
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* 第一条IP记录的偏移地址
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*
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* @var int
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*/
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private $firstip;
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/**
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* 最后一条IP记录的偏移地址
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*
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* @var int
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*/
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private $lastip;
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/**
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* IP记录的总条数（不包含版本信息记录）
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*
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* @var int
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*/
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private $totalip;
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/**
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* 构造函数，打开 QQWry.Dat 文件并初始化类中的信息
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*
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* @param string $filename
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* @return IpLocation
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*/
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public function __construct($filename = "UTFWry.dat") {
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$this->fp = 0;
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if (($this->fp = fopen(dirname(__FILE__).'/'.$filename, 'rb')) !== false) {
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$this->firstip = $this->getlong();
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$this->lastip = $this->getlong();
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$this->totalip = ($this->lastip - $this->firstip) / 7;
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}
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}
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/**
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* 返回读取的长整型数
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*
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* @access private
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* @return int
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*/
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private function getlong() {
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//将读取的little-endian编码的4个字节转化为长整型数
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$result = unpack('Vlong', fread($this->fp, 4));
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return $result['long'];
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}
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/**
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* 返回读取的3个字节的长整型数
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*
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* @access private
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* @return int
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*/
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private function getlong3() {
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//将读取的little-endian编码的3个字节转化为长整型数
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$result = unpack('Vlong', fread($this->fp, 3).chr(0));
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return $result['long'];
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}
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/**
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* 返回压缩后可进行比较的IP地址
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*
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* @access private
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* @param string $ip
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* @return string
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*/
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private function packip($ip) {
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// 将IP地址转化为长整型数，如果在PHP5中，IP地址错误，则返回False，
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// 这时intval将Flase转化为整数-1，之后压缩成big-endian编码的字符串
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return pack('N', intval(ip2long($ip)));
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}
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/**
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* 返回读取的字符串
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*
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* @access private
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* @param string $data
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* @return string
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*/
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private function getstring($data = "") {
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$char = fread($this->fp, 1);
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while (ord($char) > 0) { // 字符串按照C格式保存，以\0结束
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$data .= $char; // 将读取的字符连接到给定字符串之后
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$char = fread($this->fp, 1);
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}
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return $data;
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}
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/**
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* 返回地区信息
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*
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* @access private
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* @return string
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*/
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private function getarea() {
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$byte = fread($this->fp, 1); // 标志字节
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switch (ord($byte)) {
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case 0: // 没有区域信息
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$area = "";
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break;
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case 1:
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case 2: // 标志字节为1或2，表示区域信息被重定向
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fseek($this->fp, $this->getlong3());
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$area = $this->getstring();
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break;
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default: // 否则，表示区域信息没有被重定向
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$area = $this->getstring($byte);
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break;
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}
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return $area;
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}
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private $provinces = array("黑龙江省","辽宁省","吉林省","河北省","河南省","湖北省","湖南省","山东省","山西省","陕西省",
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"安徽省","浙江省","江苏省","福建省","广东省","海南省","四川省","云南省","贵州省","青海省","甘肃省",
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"江西省","台湾省","内蒙古","宁夏","新疆","西藏","广西","北京市","上海市","天津市","重庆市","香港","澳门");
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/**
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* 根据所给 IP 地址或域名返回所在地区信息
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*
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* @access public
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* @param string $ip
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* @return array
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*/
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public function getlocation($ip='') {
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if (!$this->fp) return null; // 如果数据文件没有被正确打开，则直接返回空
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if(empty($ip)) $ip = get_client_ip();
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$location['ip'] = gethostbyname($ip); // 将输入的域名转化为IP地址
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$ip = $this->packip($location['ip']); // 将输入的IP地址转化为可比较的IP地址
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// 不合法的IP地址会被转化为255.255.255.255
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// 对分搜索
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$l = 0; // 搜索的下边界
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$u = $this->totalip; // 搜索的上边界
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$findip = $this->lastip; // 如果没有找到就返回最后一条IP记录（QQWry.Dat的版本信息）
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while ($l <= $u) { // 当上边界小于下边界时，查找失败
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$i = floor(($l + $u) / 2); // 计算近似中间记录
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fseek($this->fp, $this->firstip + $i * 7);
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$beginip = strrev(fread($this->fp, 4)); // 获取中间记录的开始IP地址
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// strrev函数在这里的作用是将little-endian的压缩IP地址转化为big-endian的格式
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// 以便用于比较，后面相同。
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if ($ip < $beginip) { // 用户的IP小于中间记录的开始IP地址时
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$u = $i - 1; // 将搜索的上边界修改为中间记录减一
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}
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else {
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fseek($this->fp, $this->getlong3());
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$endip = strrev(fread($this->fp, 4)); // 获取中间记录的结束IP地址
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if ($ip > $endip) { // 用户的IP大于中间记录的结束IP地址时
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$l = $i + 1; // 将搜索的下边界修改为中间记录加一
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}
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else { // 用户的IP在中间记录的IP范围内时
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$findip = $this->firstip + $i * 7;
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break; // 则表示找到结果，退出循环
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}
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}
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}
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//获取查找到的IP地理位置信息
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fseek($this->fp, $findip);
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$location['beginip'] = long2ip($this->getlong()); // 用户IP所在范围的开始地址
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$offset = $this->getlong3();
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fseek($this->fp, $offset);
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$location['endip'] = long2ip($this->getlong()); // 用户IP所在范围的结束地址
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$byte = fread($this->fp, 1); // 标志字节
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switch (ord($byte)) {
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case 1: // 标志字节为1，表示国家和区域信息都被同时重定向
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$countryOffset = $this->getlong3(); // 重定向地址
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fseek($this->fp, $countryOffset);
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$byte = fread($this->fp, 1); // 标志字节
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switch (ord($byte)) {
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case 2: // 标志字节为2，表示国家信息又被重定向
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fseek($this->fp, $this->getlong3());
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$location['country'] = $this->getstring();
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fseek($this->fp, $countryOffset + 4);
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$location['area'] = $this->getarea();
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break;
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default: // 否则，表示国家信息没有被重定向
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$location['country'] = $this->getstring($byte);
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$location['area'] = $this->getarea();
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break;
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}
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break;
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case 2: // 标志字节为2，表示国家信息被重定向
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fseek($this->fp, $this->getlong3());
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$location['country'] = $this->getstring();
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fseek($this->fp, $offset + 8);
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$location['area'] = $this->getarea();
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break;
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default: // 否则，表示国家信息没有被重定向
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$location['country'] = $this->getstring($byte);
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$location['area'] = $this->getarea();
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break;
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}
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if (trim($location['country']) == 'CZ88.NET') { // CZ88.NET表示没有有效信息
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$location['country'] = '未知';
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}
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if (trim($location['area']) == 'CZ88.NET') {
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$location['area'] = '';
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}
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$location['country'] = @iconv('gbk','utf-8',$location['country']); //转换格式，防止乱码
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$location['area'] = @iconv('gbk','utf-8',$location['area']); //转换格式，防止乱码
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foreach($this->provinces as $v) {
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if(strpos($location['country'],$v) === 0) {
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$location['province'] = $v;
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$location['city'] = str_replace($v,'',$location['country']);
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break;
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}
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}
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if(empty($location['province'])) $location['province'] = $location['country'];
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if(empty($location['city'])) $location['city'] = $location['country'];
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return $location;
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}
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/**
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* 析构函数，用于在页面执行结束后自动关闭打开的文件。
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*
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*/
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public function __destruct() {
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if ($this->fp) {
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fclose($this->fp);
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}
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$this->fp = 0;
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}
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} |
