session_unset
PHP function
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(PHP 4, PHP 5, PHP 7, PHP 8)
Free all session variables
Description
session_unset(): bool
The session_unset() function frees all session variables currently registered.
Parameters Parameters
Return Values
Success
Changelog
| Version | Description |
|---|---|
| 7.2.0 | The return type of this function is bool now. Formerly, it has been void. |
Notes
Note
If $_SESSION is used, use unset() to unregister a session variable, i.e. unset($_SESSION['varname']);.
Caution
Do NOT unset the whole $_SESSION with unset($_SESSION) as this will disable the registering of session variables through the $_SESSION superglobal.
Note
The use of session_unset() is identical to $_SESSION = [].
Caution
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.