IP地理位置查询类(纯真IP地址库)

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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
纯真IP地址库 http://www.cz88.net/ 安装完成后，到安装目录把 qqwry.dat 拷贝出来

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<?php
/**
 * IP 地理位置查询类
 */
class IpLocation
{
    private $_provinces = ['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', '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', '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'];
    private $_filterCity = ['北京市', '上海市', '天津市', '重庆市'];
     
    /**
     * qqwry.dat文件指针
     *
     * @var resource
     */
    private $fp;
 
    /**
     * 第一条IP记录的偏移地址
     *
     * @var int
     */
    private $firstip;
 
    /**
     * 最后一条IP记录的偏移地址
     *
     * @var int
     */
    private $lastip;
 
    /**
     * IP记录的总条数（不包含版本信息记录）
     *
     * @var int
     */
    private $totalip;
 
    /**
     * 构造函数,打开 qqwry.dat 文件并初始化类中的信息
     *
     * @param   string  $filename
     * @return  IpLocation
     */
    public function __construct($filename = 'qqwry.dat')
    {
        $this->fp = 0;
        if (($this->fp = fopen(dirname(__FILE__) . '/' . $filename, 'rb')) !== false) {
            $this->firstip = $this->getlong();
            $this->lastip = $this->getlong();
            $this->totalip = ($this->lastip - $this->firstip) / 7;
             
            // 注册析构函数,使其在程序执行结束时执行
            register_shutdown_function(array(&$this, '__destruct'));
        }
    }
 
    /**
     * 返回读取的长整型数
     *
     * @access private
     * @return int
     */
    private function getlong()
    {
        // 将读取的little-endian编码的4个字节转化为长整型数
        $result = unpack('Vlong', fread($this->fp, 4));
        return $result['long'];
    }
 
    /**
     * 返回读取的3个字节的长整型数
     *
     * @access private
     * @return int
     */
    private function getlong3()
    {
        // 将读取的little-endian编码的3个字节转化为长整型数
        $result = unpack('Vlong', fread($this->fp, 3) . chr(0));
        return $result['long'];
    }
 
    /**
     * 返回压缩后可进行比较的IP地址
     *
     * @access private
     * @param string $ip
     * @return string
     */
    private function packip($ip)
    {
        // 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
        // 这时intval将Flase转化为整数-1,之后压缩成big-endian编码的字符串
        return pack('N', intval(ip2long($ip)));
    }
 
    /**
     * 返回读取的字符串
     *
     * @access private
     * @param string $data
     * @return string
     */
    private function getstring($data = '')
    {
        $char = fread($this->fp, 1);
        while (ord($char) > 0) {            // 字符串按照C格式保存,以\0结束
            $data .= $char;                 // 将读取的字符连接到给定字符串之后
            $char = fread($this->fp, 1);
        }
        return $data;
    }
 
    /**
     * 返回地区信息
     *
     * @access private
     * @return string
     */
    private function getarea()
    {
        $byte = fread($this->fp, 1);                // 标志字节
        switch (ord($byte)) {
            case 0:                                 // 没有区域信息
                $area = '';
                break;
            case 1:
            case 2:                                 // 标志字节为1或2，表示区域信息被重定向
                fseek($this->fp, $this->getlong3());
                $area = $this->getstring();
                break;
            default:                                // 否则,表示区域信息没有被重定向
                $area = $this->getstring($byte);
                break;
        }
        return $area;
    }
 
    /**
     * 根据所给 IP 地址或域名返回所在地区信息
     *
     * @access public
     * @param string $ip
     * @return array
     */
    public function getlocation($ip, $convert_utf8 = true)
    {
        if (!$this->fp) return null;                        // 如果数据文件没有被正确打开，则直接返回空
        $location['ip'] = gethostbyname($ip);               // 将输入的域名转化为IP地址
        $ip = $this->packip($location['ip']);               // 将输入的IP地址转化为可比较的IP地址,不合法的IP地址会被转化为255.255.255.255
 
        // 对分搜索
        $l = 0;                                             // 搜索的下边界
        $u = $this->totalip;                                // 搜索的上边界
        $findip = $this->lastip;                            // 如果没有找到就返回最后一条IP记录(qqwry.Dat的版本信息)
        while ($l <= $u) {                                  // 当上边界小于下边界时,查找失败
            $i = floor(($l + $u) / 2);                      // 计算近似中间记录
            fseek($this->fp, $this->firstip + $i * 7);
            $beginip = strrev(fread($this->fp, 4));         // 获取中间记录的开始IP地址,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,以便用于比较,后面相同
            if ($ip < $beginip) {                           // 用户的IP小于中间记录的开始IP地址时
                $u = $i - 1;                                // 将搜索的上边界修改为中间记录减一
            } else {
                fseek($this->fp, $this->getlong3());
                $endip = strrev(fread($this->fp, 4));       // 获取中间记录的结束IP地址
                if ($ip > $endip) {                         // 用户的IP大于中间记录的结束IP地址时
                    $l = $i + 1;                            // 将搜索的下边界修改为中间记录加一
                } else {                                    // 用户的IP在中间记录的IP范围内时
                    $findip = $this->firstip + $i * 7;
                    break;                                  // 则表示找到结果,退出循环
                }
            }
        }
 
        // 获取查找到的IP地理位置信息
        fseek($this->fp, $findip);
        $location['beginip'] = long2ip($this->getlong());   // 用户IP所在范围的开始地址
        $offset = $this->getlong3();
        fseek($this->fp, $offset);
        $location['endip'] = long2ip($this->getlong());     // 用户IP所在范围的结束地址
        $byte = fread($this->fp, 1);                        // 标志字节
        switch (ord($byte)) {
            case 1:                                         // 标志字节为1,表示国家和区域信息都被同时重定向
                $countryOffset = $this->getlong3();         // 重定向地址
                fseek($this->fp, $countryOffset);
                $byte = fread($this->fp, 1);                // 标志字节
                switch (ord($byte)) {
                    case 2:                                 // 标志字节为2,表示国家信息又被重定向
                        fseek($this->fp, $this->getlong3());
                        $location['country'] = $this->getstring();
                        fseek($this->fp, $countryOffset + 4);
                        $location['area'] = $this->getarea();
                        break;
                    default:                                // 否则,表示国家信息没有被重定向
                        $location['country'] = $this->getstring($byte);
                        $location['area'] = $this->getarea();
                        break;
                }
                break;
            case 2:                                         // 标志字节为2,表示国家信息被重定向
                fseek($this->fp, $this->getlong3());
                $location['country'] = $this->getstring();
                fseek($this->fp, $offset + 8);
                $location['area'] = $this->getarea();
                break;
            default:                                        // 否则,表示国家信息没有被重定向
                $location['country'] = $this->getstring($byte);
                $location['area'] = $this->getarea();
                break;
        }
        if (trim($location['country']) == 'CZ88.NET') {     // CZ88.NET表示没有有效信息
            $location['country'] = '未知';
        }
        if (trim($location['area']) == 'CZ88.NET') {
            $location['area'] = '';
        }
        if ($convert_utf8) {
            $location['country'] = iconv('GB2312', 'UTF-8//IGNORE', $location['country']);
            $location['area'] = iconv('GB2312', 'UTF-8//IGNORE', $location['area']);
        }
        foreach($this->_provinces as $province) {
            if (strpos($location['country'], $province) === 0) {
               $location['province'] = $province;
               if (in_array($province, $this->_filterCity)) {
                   $location['city'] = $province;
               } else {
                   $location['city'] = str_replace($province, '', $location['country']);
               }
               empty($location['city']) && $location['city'] = $province;
               break;
            }
        }
        // country 错误值：[未知,局域网,IANA]
        return $location;
    }
 
    /**
     * 析构函数,用于在页面执行结束后自动关闭打开的文件
     */
    public function __destruct() {
        if ($this->fp) {
            fclose($this->fp);
        }
        $this->fp = 0;
    }
}

$ip_location_obj = new IpLocation();
echo '<pre>';
$address = $ip_location_obj->getlocation('127.0.0.1');
print_r($address);
$address = $ip_location_obj->getlocation('10.10.0.0');
print_r($address);
$address = $ip_location_obj->getlocation('123.164.3.9');
print_r($address);
$address = $ip_location_obj->getlocation('175.160.104.123');
print_r($address);
$address = $ip_location_obj->getlocation('122.136.104.123');
print_r($address);
$address = $ip_location_obj->getlocation('106.112.104.123');
print_r($address);
$address = $ip_location_obj->getlocation('123.8.104.123');
print_r($address);
$address = $ip_location_obj->getlocation('58.48.104.123');
print_r($address);
$address = $ip_location_obj->getlocation('222.240.104.123');
print_r($address);
$address = $ip_location_obj->getlocation('182.32.104.123');
print_r($address);
$address = $ip_location_obj->getlocation('118.72.104.123');
print_r($address);
$address = $ip_location_obj->getlocation('202.200.104.123');
print_r($address);
$address = $ip_location_obj->getlocation('60.168.104.123');
print_r($address);
$address = $ip_location_obj->getlocation('115.224.104.123');
print_r($address);
$address = $ip_location_obj->getlocation('117.80.104.123');
print_r($address);
$address = $ip_location_obj->getlocation('120.32.104.123');
print_r($address);
$address = $ip_location_obj->getlocation('113.96.104.123');
print_r($address);
$address = $ip_location_obj->getlocation('223.198.104.123');
print_r($address);
$address = $ip_location_obj->getlocation('182.128.104.123');
print_r($address);
$address = $ip_location_obj->getlocation('182.240.104.123');
print_r($address);
$address = $ip_location_obj->getlocation('114.138.104.123');
print_r($address);
$address = $ip_location_obj->getlocation('223.220.104.123');
print_r($address);
$address = $ip_location_obj->getlocation('42.88.104.123');
print_r($address);
$address = $ip_location_obj->getlocation('115.148.104.123');
print_r($address);
$address = $ip_location_obj->getlocation('61.57.155.236');
print_r($address);
$address = $ip_location_obj->getlocation('123.178.104.123');
print_r($address);
$address = $ip_location_obj->getlocation('124.224.104.123');
print_r($address);
$address = $ip_location_obj->getlocation('49.112.104.123');
print_r($address);
$address = $ip_location_obj->getlocation('27.98.224.123');
print_r($address);
$address = $ip_location_obj->getlocation('222.216.104.123');
print_r($address);
$address = $ip_location_obj->getlocation('58.31.104.123');
print_r($address);
$address = $ip_location_obj->getlocation('124.76.104.123');
print_r($address);
$address = $ip_location_obj->getlocation('221.196.104.123');
print_r($address);
$address = $ip_location_obj->getlocation('125.80.104.123');
print_r($address);
$address = $ip_location_obj->getlocation('202.97.96.123');
print_r($address);
$address = $ip_location_obj->getlocation('202.175.34.123');
print_r($address);
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