Duplicate code is one of the most pungent code smells. A rule that is often used is to re-structure code once it is duplicated in three or more places.
Common duplication problems, and corresponding solutions are:
| 1 | <?php |
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| 10 | class NotificationController extends Controller |
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| 11 | { |
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| 12 | /** |
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| 13 | * Constructor |
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| 14 | */ |
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| 15 | public function __construct() |
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| 21 | |||
| 22 | /** |
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| 23 | * Show the notifications. |
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| 24 | * |
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| 25 | * @return \Illuminate\View\View |
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| 26 | */ |
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| 27 | public function index(): View |
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| 47 | |||
| 48 | /** |
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| 49 | * Delete a notification by its id. |
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| 50 | * |
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| 51 | * @param \Illuminate\Http\Request $request The current request. |
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| 52 | * |
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| 53 | * @return \Illuminate\Http\JsonResponse |
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| 54 | */ |
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| 55 | View Code Duplication | public function delete(Request $request): JsonResponse |
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| 70 | |||
| 71 | /** |
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| 72 | * Mark a notification as read. |
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| 73 | * |
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| 74 | * @param \Illuminate\Http\Request $request The current request. |
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| 75 | * |
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| 76 | * @return \Illuminate\Http\JsonResponse |
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| 77 | */ |
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| 78 | View Code Duplication | public function markAsRead(Request $request): JsonResponse |
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| 93 | |||
| 94 | /** |
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| 95 | * Mark all notifications as read. |
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| 96 | * |
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| 97 | * @return \Illuminate\Http\JsonResponse |
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| 98 | */ |
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| 99 | public function markAllAsRead(): JsonResponse |
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| 108 | } |
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| 109 |
In PHP it is possible to write to properties without declaring them. For example, the following is perfectly valid PHP code:
Generally, it is a good practice to explictly declare properties to avoid accidental typos and provide IDE auto-completion: