(PHP 4 >= 4.2.0, PHP 5 <= 5.1.2) Set data session unstructured data

(PHP 4 >= 4.2.0, PHP 5 <= 5.1.2) Get session count

(PHP >=5.4.0) Returns the current session status

(PHP 4 >= 4.2.0, PHP 5 <= 5.1.2) Lock a session

(PHP 4 >= 4.2.0, PHP 5 <= 5.1.2) Set/get session timeout

(PHP 5 >= 5.6.0, PHP 7) Discard session array changes and finish session

(PHP 4 >= 4.2.0, PHP 5 <= 5.1.2) Get data session unstructured data

(PHP 5 >= 5.4.0, PHP 7) Close the session

(PHP 5 >= 5.4.0, PHP 7) Cleanup old sessions

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