网络会话何时开始和结束？

This is more of a conceptual question. But I was wondering when a web session starts and ends when using PHP. I'm pretty sure the session starts when the user first requests any page that has the session_start() function. But does the session end when the user navigates to another page in the same tab? Is the same session preserved across multiple tabs and windows of the same browser? To preserve a session after the browser closes, do you have to use cookies?

1. Sessions start with the first session_start()
2. Sessions end after session.gc_maxlifetime and/or session.cookie_lifetime and/or some more things to do with PHP's session garbage collector.
3. Cookies are required to use sessions since PHP sets a cookie containing the user's SESSID, and the browser automatically sends it back with each request.
   • You can delete this cookie, which revokes your access to the session, but your session data still technically exists until the timeouts expire and the garbage collector runs.

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