jignesh1 wrote:when user close the browser the session are automatically destroyed
More accurately, if the user closes the browser AND IF your session.cookie_lifetime configuration setting is set to 0 (which is the default config), then the session cookie will be automatically expired by the browser, which will stop the user from reconnecting to that session if they re-launch their browser and connect to your page, since there will be no cookie with the session ID for it to send.
This does not change anything on the server side, as it has no way to know that the user has closed his browser. The session data on the server will hang around until the the time specified by the session.gc_maxlifetime config setting has passed since the data was last accessed, at which point the garbage collection routine will delete it the next time any page calls session_start().
