function getClientIp($type = 0) {
    $type       =  $type ? 1 : 0;
    static $ip  =   NULL;
    if ($ip !== NULL) return $ip[$type];
    if($_SERVER['HTTP_X_REAL_IP']){//nginx 代理模式下，獲取客戶端真實IP
        $ip=$_SERVER['HTTP_X_REAL_IP'];     
    }elseif (isset($_SERVER['HTTP_CLIENT_IP'])) {//客戶端的ip
        $ip     =   $_SERVER['HTTP_CLIENT_IP'];
    }elseif (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) {//瀏覽當前頁面的使用者計算機的閘道器
        $arr    =   explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']);
        $pos    =   array_search('unknown',$arr);
        if(false !== $pos) unset($arr[$pos]);
        $ip     =   trim($arr[0]);
    }elseif (isset($_SERVER['REMOTE_ADDR'])) {
        $ip     =   $_SERVER['REMOTE_ADDR'];//瀏覽當前頁面的使用者計算機的ip地址
    }else{
        $ip=$_SERVER['REMOTE_ADDR'];
    }
    // IP地址合法驗證
    $long = sprintf("%u",ip2long($ip));
    $ip   = $long ? array($ip, $long) : array('0.0.0.0', 0);
    return $ip[$type];
}