sonyet 发表于 2017-4-10 11:22:48

【转】php实现通过ip查询地理位置

  可用类及调用方法:
  <?php
  
/**
* IP地理位置查询类
*
* @author 马秉尧
* @version 1.5
* @copyright 2005 CoolCode.CN
*/
class IpLocation {
    /**
     * QQWry.Dat文件指针
     *
     * @var resource
     */
    var $fp;

    /**
     * 第一条IP记录的偏移地址
     *
     * @var int
     */
    var $firstip;

    /**
     * 最后一条IP记录的偏移地址
     *
     * @var int
     */
    var $lastip;

    /**
     * IP记录的总条数(不包含版本信息记录)
     *
     * @var int
     */
    var $totalip;

    /**
     * 返回读取的长整型数
     *
     * @access private
     * @return int
     */
    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
     */
    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 $ip
     * @return string
     */
    function packip($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 $data
     * @return string
     */
    function getstring($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
     */
    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 $ip
     * @return array
     */
    function getlocation($ip) {
        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'] = $this->getarea();
                break;
        }
        if ($location['country'] == " CZ88.NET") { // CZ88.NET表示没有有效信息
            $location['country'] = "未知";
        }
        if ($location['area'] == " CZ88.NET") {
            $location['area'] = "";
        }
        return $location;
    }

    /**
     * 构造函数,打开 QQWry.Dat 文件并初始化类中的信息
     *
     * @param string $filename
     * @return IpLocation
     */
    function IpLocation($filename = "QQWry.Dat") {
        $this->fp = 0;
        if (($this->fp = fopen($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, '_IpLocation'));
        }
    }

    /**
     * 析构函数,用于在页面执行结束后自动关闭打开的文件。
     *
     */
    function _IpLocation() {
        if ($this->fp) {
            fclose($this->fp);
        }
        $this->fp = 0;
    }
}
  $mtime = explode(' ', microtime());
$starttime = $mtime + $mtime;
  echo "<pre>";
$ip= "202.101.111.195";
$iplocation = new IpLocation();
$location = $iplocation->getlocation($ip);
print_r($location);
  $mtime = explode(' ', microtime());
$endtime = $mtime + $mtime;
var_dump($endtime-$starttime);
?>
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