获取用户ip

public function getIp(){
       //浏览当前页面的用户计算机的网关
       if(@$_SERVER["HTTP_X_FORWARDED_FOR"]){
           $ip = $_SERVER["HTTP_X_FORWARED_FOR"]; 
       }else if(@$_SERVER["HTTP_CLIENT_IP"]){
           //客户端的ip
           $ip = $_SERVER["HTTP_CLIENT_IP"];
       }else if(@$_SERVER["REMOTE_ADDR"]){
           //浏览当前页面的用户计算机的ip地址
           $ip = $_SERVER["REMOTE_ADDR"];
       }else if(@getenv("HTTP_X_FORWARED_FOR")){
           $ip = getenv("HTTP_X_FORWARED_FOR");
       }else if(@getenv("HTTP_CLIENT_IP")){
           $ip = getenv("HTTP_CLIENT_IP");
       }else if(@getenv("REMOTE_ADDR")){
           $ip = getenv("REMOTE_ADDR");
       }else{
           $ip = "Unknown";
       }
       
       return $ip;
   }