constants

ENTITY ENTITY

SID (string)
Constant containing either the session name and session ID in the form of "name=ID" or empty string if session ID was set in an appropriate session cookie. This is the same id as the one returned by session_id.

PHP_SESSION_DISABLED (int)
Return value of session_status if sessions are disabled.

PHP_SESSION_NONE (int)
Return value of session_status if sessions are enabled, but no session exists.

PHP_SESSION_ACTIVE (int)
Return value of session_status if sessions are enabled, and a session exists.