application\modules\social\controllers\UserController::actions PHP Method

    public function actions()
    {
        return ['captcha' => ['class' => 'yupe\\components\\actions\\YCaptchaAction', 'backColor' => 0xffffff, 'testLimit' => 1, 'minLength' => Yii::app()->getModule('user')->minCaptchaLength]];
    }