session-unset
session_unset
Free all session variables
ENTITY
bool
session_unset
The session_unset function frees all session variables currently registered.
ENTITY ENTITY
ENTITY
ENTITY
ENTITY
| ENTITY | ENTITY |
|---|---|
| 7.2.0 | The return type of this function is bool now. Formerly, it has been void. |
ENTITY
If $_SESSION is used, use unset to unregister a session variable, i.e. unset($_SESSION['varname']);.
Do NOT unset the whole $_SESSION with unset($_SESSION) as this will disable the registering of session variables through the $_SESSION superglobal.
The use of session_unset is identical to $_SESSION = [].
This function works only if a session is active. It will not clear the $_SESSION array if the session has not been started yet or has already been destroyed. Use $_SESSION = [] to unset all session variables even if the session is not active.