PHP, the operation of multiple users, multiple threads of the session, implementation of user login status session value of the automatic update

Code:

$my _session_id=$_cookie[session_name ()];//saves the session ID of the current person;

Session_Start ();

...//Some operations, such as verifying that the current user has permission to operate session updates

{//here can loop to manipulate multiple other users ' sessions

Session_write_close ();
session_id ($_refresh_user_sessoin_id);//$_refresh_user_sessoin_id is the ID of the session of the other user who wants to update; SESSION_ID () function without parameters can obtain the current user's SessionID, but need to session-start (), otherwise use $_cookie[session_name ()];
Session_Start ();

..//To operate the session to be manipulated.

End of}//loop processing

Session_write_close ();
session_id ($my _session_id);//restore session of current user
Session_Start ();