must i handle session garbage?

when the user closes his browser, us开发者_运维问答ually he losts the cookie that marks the session. but the file in the server is not deleted and remains there, useless.

do i have to handle it? or it's a server's business?

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It's a server's business. PHP has a "garbage collector" mechanism for them. See the session.gc_probability, session.gc_divisor and session.gc_maxlifetime configuration options.

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Nope. You should never take care of it - it is php internals' business.