php获取客户IP

function getIp(){
        $ip = ‘‘;
        if(!empty($_SERVER[‘HTTP_CLIENT_IP‘])){
            $ip = $_SERVER[‘HTTP_CLIENT_IP‘];
        }else if(!empty($_SERVER[‘HTTP_X_FORWARDED_FOR‘])){
            $ip = $_SERVER[‘HTTP_X_FORWARDED_FOR‘];
        }else if(!empty($_SERVER[‘REMOTE_ADDR‘])){
            $ip = $_SERVER[‘REMOTE_ADDR‘];
        }else{
            $ip = ‘‘;
        }
        return bindec(decbin(ip2long($ip)));
    }