求 PHP 设置管理员帐号session的有效期 代码
比如，管理员登录之后，10分钟不刷新页面，就让此session失效，再次请求页面时，需要重新登录。
------解决方案--------------------
用session记录上次登录时间为当前时间。 以当前时间-上次登录时间与10分钟作比较。如果大于10分钟则销毁session。否则更新session为当前时间。
------解决方案--------------------
写cookie
------解决方案--------------------
php session 默认应该是1440s 也就是24 min
你可以从 php.ini 修改。
也可以这么写吧。
session.gc_maxlifetime="600";//这里是有效时间
------解决方案--------------------
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