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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8 | class ArticleController extends Controller |
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9 | { |
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10 | public function __construct() |
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16 | |||
17 | /** |
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18 | * Show the list of all articles. |
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19 | * |
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20 | * @return \Illuminate\Http\Response |
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21 | */ |
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22 | public function index() |
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29 | |||
30 | /** |
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31 | * Show the article by his id. |
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32 | * |
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33 | * @return \Illuminate\Http\Response |
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34 | */ |
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35 | View Code Duplication | public function show(Request $request, $slug, $id) |
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62 | } |
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63 |
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: