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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21 | /** |
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22 | * @var ViewHandlerInterface |
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23 | */ |
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24 | private $viewHandler; |
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26 | /** |
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27 | * @var TaxonViewFactoryInterface |
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28 | */ |
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29 | private $taxonViewFactory; |
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31 | public function __construct( |
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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.