$_SERVER['LOCAL_ADDR']和$_SERVER['SERVER_ADDR']是什么错误?

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Release: 2016-06-13 09:58:49
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$_SERVER['LOCAL_ADDR']和$_SERVER['SERVER_ADDR']是什么东东??
在某一网站程序的php文件中看到这段代码:$md5str = (((('EHTAZIYT'.$ep).$_SERVER['SERVER_ADDR']).$_SERVER['LOCAL_ADDR']).'22.90h7^aaz0(!skZnmLa03#nVAc_f(h-a!)wsx~9dlP1%uXJnB8.65E3zYYwa');可我运行到些段代码时老是会停下来,弹出如下错误信息Notice: Undefined index。指示$_SERVER['LOCAL_ADDR']和$_SERVER['SERVER_ADDR']为无效变量。请问:$_SERVER['LOCAL_ADDR']和$_SERVER['SERVER_ADDR']到底是什么东西,我查php手册也没查出,可这段代码却出现在商业程序中,已经过数年的运行检验,不应该是错误的。
请知道的兄弟姐妹们能解答下。

------解决方案--------------------
“SERVER_ADDR” 
当前运行脚本所在的服务器的 IP 地址。 
“REMOTE_ADDR” 
正在浏览当前页面用户的 IP 地址。
LOCAL_ADDR不晓得是啥,估计是自己加进去的
------解决方案--------------------
$_SERVER['LOCAL_ADDR'] 在PHP5中已经没有了

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