SESSION总会在配置的时间内失效吗
SESSION并不是总会在配置的时间内失效，虽然默认情况下，session过期时间是指用户再次操作之间的长度，但是也可以强制它，从session生成算起。
SESSION总会在配置的时间内失效吗？
PHP用SESSION保存会话时，无论如何操作，SESSION总是会在配置的时间内(比如24分钟)失效吗？
默认情况下，session过期时间指你再次操作之间长度，你每次进行一次操作，session生成周期都会重置为24分钟，如果两次操作时间间隔大于24分钟，则session会失效。
这只是默认情况下，你也可以让它强制它，从session生成算起，只要一过24分钟，马上失效，无论中间进行过多少操作。
你也可以配置session永不过期，配置时候没有永不过期这个选项，可以配置一个很大的过期时间，比如30年
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