App\Controllers\Auth\PasswordController::postChangePassword PHP Method

    public function postChangePassword($request, $response)
    {
        $validation = $this->validator->validate($request, ['password_old' => v::noWhitespace()->notEmpty()->matchesPassword($this->auth->user()->password), 'password' => v::noWhitespace()->notEmpty()]);
        if ($validation->failed()) {
            return $response->withRedirect($this->router->pathFor('auth.password.change'));
        }
        $this->auth->user()->setPassword($request->getParam('password'));
        $this->flash->addMessage('info', 'Your password was changed');
        return $response->withRedirect($this->router->pathFor('home'));
    }