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
[!NOTE] If
$_SESSIONis used, useunsetto unregister a session variable, i.e.unset($_SESSION['varname']);.
[!CAUTION] Do NOT unset the whole
$_SESSIONwithunset($_SESSION)as this will disable the registering of session variables through the$_SESSIONsuperglobal.
[!NOTE] The use of
session_unsetis identical to$_SESSION = [].
[!CAUTION] This function works only if a session is active. It will not clear the
$_SESSIONarray if the session has not been started yet or has already been destroyed. Use$_SESSION = []to unset all session variables even if the session is not active.
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