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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19 | class ImageRoute implements RouteInterface |
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20 | { |
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21 | /** |
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22 | * Default route options |
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23 | * |
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24 | * @var array |
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25 | */ |
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26 | protected $options = [ |
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27 | 'controller' => \SvImages\Controller\ImageController::class, |
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28 | 'action' => 'image', |
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29 | 'allow_options_override' => true, |
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30 | ]; |
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31 | |||
32 | /** |
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33 | * Create a new page route. |
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34 | * |
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35 | * @param array $options |
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36 | */ |
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37 | 5 | public function __construct(array $options = []) |
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47 | |||
48 | /** |
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49 | * Match a given request. |
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50 | * |
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51 | * @param Request $request |
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52 | * |
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53 | * @return RouteMatch|null |
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54 | */ |
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55 | public function match(Request $request) |
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82 | |||
83 | /** |
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84 | * {@inheritDoc} |
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85 | */ |
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86 | 5 | public function assemble(array $params = [], array $options = []) |
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112 | |||
113 | /** |
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114 | * {@inheritDoc} |
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115 | */ |
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116 | public function getAssembledParams() |
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121 | |||
122 | /** |
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123 | * @private |
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124 | * @deprecated |
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125 | */ |
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126 | public static function factory($options = []) |
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130 | } |
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131 |
Let’s take a look at an example:
In the above example, the authenticate() method works fine as long as you just pass instances of MyUser. However, if you now also want to pass a different implementation of User which does not have a getDisplayName() method, the code will break.
Available Fixes
Change the type-hint for the parameter:
Add an additional type-check:
Add the method to the interface: