Passwd_Driver::changePassword PHP Method

    public function changePassword($user, $oldpass, $newpass)
    {
        try {
            $user = Horde::callHook('username', array($user, $this), 'passwd');
        } catch (Horde_Exception_HookNotSet $e) {
        }
        $this->_changePassword($user, $oldpass, $newpass);
    }