来自 http://www.phpchina.com/bbs/thread-12239-1-1.html
在PHP 中用 $_SERVER["REMOTE_ADDR"] 来取得客户端的 IP 地址
但如果客户端是使用代理服务器来访问
那取到的就是代理服务器的 IP 地址
要想透过代理服务器取得客户端的真实 IP 地址
就要使用 $_SERVER["HTTP_X_FORWARDED_FOR"] 来读取
但并不是每个代理服务器都能用 $_SERVER["HTTP_X_FORWARDED_FOR"] 来读取客户端的真实 IP
有些用此方法读取到的仍然是代理服务器的 IP
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