(PHP 4, PHP 5, PHP 7) Sets user-level session storage functions

(PHP 4, PHP 5, PHP 7) Get and/or set the current session id

(PHP 4, PHP 5 < 5.4.0) Register one or more global variables with the current session

(PHP 5 >= 5.6.0, PHP 7) Re-initialize session array with original values

(PHP 4, PHP 5 < 5.4.0) Find out whether a global variable is registered in a session

(PHP 4, PHP 5, PHP 7) Free all session variables

(PECL session_pgsql SVN) Get current save handler status

(PHP 4 >= 4.0.4, PHP 5, PHP 7) Write session data and end session

(PHP 4 >= 4.3.2, PHP 5, PHP 7) Update the current session id with a newly generated one

(PHP 4, PHP 5, PHP 7) Destroys all data registered to a session