Notice: Undefined index: HTTP_REFERER in,该如何解决
Notice: Undefined index: HTTP_REFERER in
Notice: Undefined index: HTTP_REFERER in
无法登录网站后台，出现这个提示，以前可以登录的，请教这是怎么回事？
------解决思路----------------------
改为
define('PREV_URL', isset($_SERVER["HTTP_REFERER"]) ? $_SERVER["HTTP_REFERER"] : ''); //上一页地址
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