获得用户的真实IP地址

real_server_ip.php

<?php
/**
 * 获取服务器的ip
 * @access      public
 * @return string
 **/
function real_server_ip(){
  static $serverip = NULL;
 
	if ($serverip !== NULL){
		return $serverip;
	}
	if (isset($_SERVER)){
		if (isset($_SERVER['SERVER_ADDR'])){
			$serverip = $_SERVER['SERVER_ADDR'];
		}
		else{
			$serverip = '0.0.0.0';
		}
	}
	else{
		$serverip = getenv('SERVER_ADDR');
	}
	return $serverip;
}
?>