allCourse(); $this->cart(); $this->checkout(); $this->dashboard(); $this->singleCourse(); $this->thankyou(); $this->certificate(); } public function allCourse(): AllCourseController { if (is_null($this->allCourse)) { $this->allCourse = new AllCourseController(); } return $this->allCourse; } public function cart(): CartController { if (is_null($this->cart)) { $this->cart = new CartController(); } return $this->cart; } public function checkout(): CheckoutController { if (is_null($this->checkout)) { $this->checkout = new CheckoutController(); } return $this->checkout; } public function dashboard(): DashboardController { if (is_null($this->dashboard)) { $this->dashboard = new DashboardController(); } return $this->dashboard; } public function singleCourse(): SingleCourseController { if (is_null($this->singleCourse)) { $this->singleCourse = new SingleCourseController(); } return $this->singleCourse; } public function thankyou(): ThankyouController { if (is_null($this->thankyou)) { $this->thankyou = new ThankyouController(); } return $this->thankyou; } public function certificate(): CertificateController { if (is_null($this->certificate)) { $this->certificate = new CertificateController(); } return $this->certificate; } public static function instance() { if (is_null(self::$_instance)) { self::$_instance = new self(); } return self::$_instance; } }