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:
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| 14 | final class ShowTaxonTreeAction |
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| 15 | { |
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| 16 | /** |
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| 17 | * @var TaxonRepositoryInterface |
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| 18 | */ |
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| 19 | private $taxonRepository; |
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| 20 | |||
| 21 | /** |
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| 22 | * @var ViewHandlerInterface |
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| 23 | */ |
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| 24 | private $viewHandler; |
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| 25 | |||
| 26 | /** |
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| 27 | * @var TaxonViewFactoryInterface |
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| 28 | */ |
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| 29 | private $taxonViewFactory; |
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| 30 | |||
| 31 | public function __construct( |
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| 40 | |||
| 41 | /** |
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| 42 | * @param Request $request |
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| 43 | * |
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| 44 | * @return Response |
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| 45 | */ |
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| 46 | public function __invoke(Request $request): Response |
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| 61 | View Code Duplication | private function buildTaxonView(TaxonInterface $taxon, $locale): TaxonView |
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| 71 | } |
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This check looks for parameters that are defined as one type in their type hint or doc comment but seem to be used as a narrower type, i.e an implementation of an interface or a subclass.
Consider changing the type of the parameter or doing an instanceof check before assuming your parameter is of the expected type.