获取对方真实IP程序之二

获取对方真实IP程序之二

还要有一个处理 HTTP_X_FORWARDED_FOR（如果有值的话）的函数：

    function explode_and_foreach_them($forwarded_ips){   
      
        $arr = explode(',', $forwarded_ips);   
        if(0<count($arr)){   
            foreach ($arr as $ip){   
                $ip = trim($ip);   
                if ($ip != 'unknown'){   
                    $realip = $realip.'+'.$ip;   
                    break;   
                }   
            }   
            return $realip;   
        }else{   
        return $forwarded_ips;   
        }   
      
    }  

 

返回真实的客户端IP：

    function get_real_client_ip(){   
        if (!emptyempty($_SERVER['HTTP_CLIENT_IP']) && validate_ip($_SERVER['HTTP_CLIENT_IP'])) {   
            return $_SERVER['HTTP_CLIENT_IP'];   
        }   
        if (!emptyempty($_SERVER['HTTP_X_FORWARDED_FOR']) && validate_ipSERVER['HTTP_X_FORWARDED_FOR'])) {   
            return explode_and_foreach_them($_SERVER['HTTP_X_FORWARDED_FOR']);   
        }   
        if (!emptyempty($_SERVER['HTTP_X_FORWARDED']) && validate_ip($_SERVER['HTTP_X_FORWARDED'])) {   
            return $_SERVER['HTTP_X_FORWARDED'];   
        }   
        if (!emptyempty($_SERVER['HTTP_X_CLUSTER_CLIENT_IP']) && validate_ip($_SERVER['HTTP_X_CLUSTER_CLIENT_IP'])) {   
            return $_SERVER['HTTP_X_CLUSTER_CLIENT_IP'];   
        }   
        if (!emptyempty($_SERVER['HTTP_FORWARDED_FOR']) && validate_ip($_SERVER['HTTP_FORWARDED_FOR'])) {   
            return explode_and_foreach_them($_SERVER['HTTP_FORWARDED_FOR']);   
        }   
        if (!emptyempty($_SERVER['HTTP_FORWARDED']) && validate_ip($_SERVER['HTTP_FORWARDED'])) {   
            return $_SERVER['HTTP_FORWARDED'];   
        }   
        return $_SERVER['REMOTE_ADDR'];   
    }  

上面的函数调用了上上面的函数，所以，它们是要一起用的。下面的液压隔膜计量泵函数有多个return,而不是赋值给一个变量，然后返回变量，这叫Guard Clauses(后卫条款?):权威的维基百科没有收录这个词，不过倒是在Wiki概念创建者的液压隔膜计量泵网站找到了记录http://c2.com/cgi/wiki?GuardClause还有另外一个高人的描述:http://www.refactoring.com/catalog/replaceNestedConditionalWithGuardClauses.html据信，这个词最早出现在出版于1996年10月13日(上述Wiki网站标注为1997年出版，显然是错的)的一本由 KentBeck 与 Prentice Hall合写的书《Smalltalk Best Practice Patterns》(ISBN-10: : 0-13-476904-X | ISBN-13: 978-0134769042),感兴趣的淫可以找来览一览，有好事者已经在2011年将该书的一部分(仅有几百KB，应该是2-4MB才对的)的PDF格式上传至新浪爱问。

下面的函数来自于国内的某个shop的源码：

    function get_real_client_ip(){   
        static $realip = NULL;   
        if ($realip !== NULL){ return $realip; }   
        if (isset($_SERVER)){   
            if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])){   
                $realip = explode_and_foreach_them($_SERVER['HTTP_X_FORWARDED_FOR']);   
            }elseif (isset($_SERVER['HTTP_CLIENT_IP'])){   
                $realip = $_SERVER['HTTP_CLIENT_IP'];   
            }else{   
                if (isset($_SERVER['REMOTE_ADDR'])){   
                    $realip = $_SERVER['REMOTE_ADDR'];   
                }else{   
                    $realip = '0.0.0.0';   
                }   
            }   
        }else{   
      
        //getenv(string varname)获取环境变量的PHP函数,它与服务器超级全局变量数组$_SERVER的区别是:getenv()不支持IIS的isapi方式运行的php   
        //putenv(string varname)设置环境变量的PHP函数   
      
            if (getenv('HTTP_X_FORWARDED_FOR')){   
                $realip = getenv('HTTP_X_FORWARDED_FOR');   
            }elseif (getenv('HTTP_CLIENT_IP')){   
                $realip = getenv('HTTP_CLIENT_IP');   
            }else{   
                $realip = getenv('REMOTE_ADDR');   
            }   
        }   
        preg_match("/[\d\.]{7,15}/", $realip, $onlineip);   
        $realip = !emptyempty($onlineip[0]) ? $onlineip[0] : '0.0.0.0';   
      
        return $realip;   
    }  

 

精简一下上面的函数：

    function get_client_ip()   
    {   
        foreach (array(   
                    'HTTP_CLIENT_IP',   
                    'HTTP_X_FORWARDED_FOR',   
                    'HTTP_X_FORWARDED',   
                    'HTTP_X_CLUSTER_CLIENT_IP',   
                    'HTTP_FORWARDED_FOR',   
                    'HTTP_FORWARDED',   
                    'REMOTE_ADDR') as $key) {   
            if (array_key_exists($key, $_SERVER)) {   
                foreach (explode(',', $_SERVER[$key]) as $ip) {   
                    $ip = trim($ip);   http://www.huainan.gov.cn/
                    if ((bool) filter_var($ip, FILTER_VALIDATE_IP,   
                                    FILTER_FLAG_IPV4 |   
                                    FILTER_FLAG_NO_PRIV_RANGE |   
                                    FILTER_FLAG_NO_RES_RANGE)) {   
                        return $ip;   
                    }   
                }   
            }   
        }   
        return null;   
    }