PHP获取用户IP代码实现

/**
 * 获取客户IP地址
 * @return $ip
 */
 function getIp(){
 if(!empty($_SERVER["HTTP_CLIENT_IP"])){
 $ip = $_SERVER["HTTP_CLIENT_IP"];
 }
 elseif(!empty($_SERVER["HTTP_X_FORWARDED_FOR"])){
 $ip = $_SERVER["HTTP_X_FORWARDED_FOR"];
 }
 elseif(!empty($_SERVER["REMOTE_ADDR"])){
 $ip = $_SERVER["REMOTE_ADDR"];
 }
 else{
 $ip = "127.0.0.1";
 }
 return $ip;
 }