Where the values in the sessions are saved

 $_session['user_id']=4;

Where this values of session is saved.. mean开发者_如何学Gos in some file?? where??

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Yes, they are stored in a temporary file somewhere on the server your website resides on. You can specify that setting in php.ini with session.save_path.

You could also use the function session_save_path to set and get session path from your script.

Syntax:

string session_save_path ([ string $path ] )

session_save_path — Get and/or set the current session save path

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Isn't it in a temp file in session.save_path, whatever that is set to?

You might also find the answer you want in more detail here.

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By default I think php stores its session information on the server, although you can override this to store session information in cookies on the client side.

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PHP saves sessions in files. The location of these files is determined in php.ini by the session.save_path setting.