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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28 | class StatusCodeSubscriber implements EventSubscriberInterface |
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29 | { |
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30 | /** |
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31 | * @var StatusCodeInterface |
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32 | */ |
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33 | private $statusCode; |
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34 | |||
35 | /** |
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36 | * @param StatusCodeInterface|null $statusCode |
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37 | */ |
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38 | 63 | public function __construct(StatusCodeInterface $statusCode = null) |
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42 | |||
43 | /** |
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44 | * @return StatusCodeInterface |
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45 | */ |
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46 | 18 | public function getStatusCode() |
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50 | |||
51 | /** |
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52 | * @param RequestSentEvent $event |
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53 | */ |
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54 | 18 | public function onRequestSent(RequestSentEvent $event) |
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64 | |||
65 | /** |
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66 | * @param MultiRequestSentEvent $event |
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67 | */ |
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68 | 18 | public function onMultiRequestSent(MultiRequestSentEvent $event) |
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82 | |||
83 | /** |
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84 | * {@inheritdoc} |
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85 | */ |
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86 | 9 | View Code Duplication | public static function getSubscribedEvents() |
93 | |||
94 | /** |
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95 | * @param ResponseInterface $response |
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96 | * @param InternalRequestInterface $internalRequest |
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97 | * @param HttpAdapterInterface $httpAdapter |
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98 | * |
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99 | * @return HttpAdapterException |
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100 | */ |
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101 | 18 | private function createStatusCodeException( |
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117 | } |
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118 |
Unless you are absolutely sure that the expression can never be null because of other conditions, we strongly recommend to add an additional type check to your code: