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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| 24 | class FlyAdapter |
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| 25 | { |
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| 26 | /** |
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| 27 | * @param $methodMap |
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| 28 | * |
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| 29 | * @return |
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| 30 | */ |
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| 31 | public function __construct(ArrayAccess $methodMap) |
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| 36 | /** |
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| 37 | * @param $subject |
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| 38 | * |
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| 39 | * @return |
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| 40 | */ |
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| 41 | public function setSubject($subject) |
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| 48 | /** |
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| 49 | * @param $method |
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| 50 | * @param $arguments |
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| 51 | * |
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| 52 | * @return |
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| 53 | */ |
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| 54 | public function __call($method, $arguments) |
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| 60 | } |
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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: