Session_Set_Save_Handler. session_set_save_handler() sets the userlevel session storage functions which are used for storing and retrieving data associated with a session This is most useful when a storage method other than those supplied by PHP sessions is preferred eg.
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Note that session_set_save_handler must (obviously) be called before session_start() but let me get to the point Upon calling session_start() the “first time” when the session does not already exist php will spawn a new session but will not call the write handler until script execution finishes Thus the session at this point exists in the server process memory but won’t be.