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<?php class Cart { public function save(object $repo = null) { if ($repo === null || !$repo instanceof CartRepository) { throw new Exception('Save the cart using the CartRepository' . "\n"); } $repo->save($this); } } class CartRepository { public function save(Cart $cart) { return 'saved!'; } } $repo = new CartRepository(); $cart = new Cart(); try { $cart->save(); } catch (Exception $e) { echo $e->getMessage(); } echo $repo->save($cart);
Output for 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
Deprecated: Cart::save(): Implicitly marking parameter $repo as nullable is deprecated, the explicit nullable type must be used instead in /in/uHW1e on line 5 Save the cart using the CartRepository saved!
Output for 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30
Save the cart using the CartRepository saved!
preferences:
96.79 ms | 982 KiB | 4 Q