public function logout()
    {

        $id_user = $this->Auth->user('id');
        $user_change = $this->Users->get($id_user);
        $old_password = '123';
        $new_password = '321';

        if (strlen($old_password)) {
            $hasher = new DefaultPasswordHasher();
            $hasher->hash($value);
        }
        else{
            $this->Flash->success('Error clave');
        }

        debug($user_change);

        if ($hasher === $user_change->password) {

            $user_change->password = $new_password;

            if($this->Users->save($user_update))
            {
                $this->Flash->success('La clave a sido cambiada con exito.');

            }
            else
            {
                $this->Flash->success('La clave no ha podido ser cambiada.');
            }
        }
        else{
            $this->Flash->success('fallo la comparacion.');
        }


        $this->Flash->success('Has salido correctamente');
        return $this->redirect($this->Auth->logout());
    }