Questions about Sessions

Session prerequisites: script language: & nbsp; PHP/Server: Use a & nbsp; $ _ SESSION ["login"] & nbsp; and & nbsp; $ _ SESSION ["username"] & nbsp;
Prerequisites:
Script language: PHP/Server: Linux
The server uses a $ _ SESSION ["login"] and $ _ SESSION ["username"] to record whether the user is logged on and the user name.

The problem is as follows:
A1/A2 refers to the newly opened browser window (note: it is a newly opened window, not a tag)

Scenario 1: A user in the browser A1 on computer A logged on, but did not exit. $ _ SESSION ["login"] = "true"; $ _ SESSION ["username"] = "";
At this time, the browser A2 on computer A has an identical or different user quit. $ _ SESSION ["login"] = "false"; and unset ($ _ SESSION ["username"])

Question 1: What is the value of $ _ SESSION ["login"] in the browser A1 on computer? $ _ SESSION ["username?

Case 2: A user logged on to the browser on computer A, but did not exit. $ _ SESSION ["login"] = "true"; $ _ SESSION ["username"] = "";
At this time, the browser on computer B has an identical or different user quit. $ _ SESSION ["login"] = "false"; and unset ($ _ SESSION ["username"])

Question 2: What is the value of the browser $ _ SESSION ["login"] on computer? $ _ SESSION ["username?

Problem 3: the above problem is that the server only uses one session key and records the value. Will operations on different clients affect other clients.

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