PHP Sessions Destroy an entire session

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If you've got a session which you wish to destroy, you can do this with session_destroy()

    Let us assume that our session looks like this:
    Array([firstname] => Jon, [id] => 123)

    We first need to start our session:

    We can now remove all the values from the `SESSION` superglobal:
    If you omitted this step all of the global variables stored in the 
    superglobal would still exist even though the session had been destroyed.
$_SESSION = array();

// If it's desired to kill the session, also delete the session cookie.
// Note: This will destroy the session, and not just the session data!
if (ini_get("session.use_cookies")) {
    $params = session_get_cookie_params();
    setcookie(session_name(), '', time() - 42000,
        $params["path"], $params["domain"],
        $params["secure"], $params["httponly"]

//Finally we can destroy the session:

Using session_destroy() is different to using something like $_SESSION = array(); which will remove all of the values stored in the SESSION superglobal but it will not destroy the actual stored version of the session.

Note: We use $_SESSION = array(); instead of session_unset() because the manual stipulates:

Only use session_unset() for older deprecated code that does not use $_SESSION.

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