获取客户端IP地址函数

function get_ip()
{
    static $ip = NULL;
    if($ip !== NULL){return $ip;}
    if(isset($_SERVER)) {
        if(isset($_SERVER['HTTP_X_FORWARDED_FOR'])) {
            $arr = explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']);
            foreach ($arr as $ip) {
                $ip = trim($ip);
                if($ip != 'unknown') {
                    $ip = $ip;
                    break;
                }
            }
        } elseif(isset($_SERVER['HTTP_CLIENT_IP'])) {
            $ip = $_SERVER['HTTP_CLIENT_IP'];
        } else {
            if(isset($_SERVER['REMOTE_ADDR'])) {
                $ip = $_SERVER['REMOTE_ADDR'];
            } else {
                $ip = '0.0.0.0';
            }
        }
    } else {
        if(getenv('HTTP_X_FORWARDED_FOR')) {
            $ip = getenv('HTTP_X_FORWARDED_FOR');
        } elseif(getenv('HTTP_CLIENT_IP')) {
            $ip = getenv('HTTP_CLIENT_IP');
        } else {
            $ip = getenv('REMOTE_ADDR');
        }
    }
    preg_match("/[\d\.]{7,15}/", $ip, $onlineip);
    $ip = !empty($onlineip[0]) ? $onlineip[0] : '0.0.0.0';

    return $ip;
}

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