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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16 | class SimpleAction extends AbstractAction implements RowDataAwareInterface |
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17 | { |
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18 | |||
19 | use RowDataAwareTrait; |
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20 | |||
21 | /** |
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22 | * @return string |
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23 | */ |
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24 | public function getUrl() |
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38 | |||
39 | /** |
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40 | * @param array $matches |
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41 | * @return mixed|string |
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42 | */ |
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43 | View Code Duplication | protected function replaceCallback($matches) |
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59 | |||
60 | /** |
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61 | * @return bool|mixed |
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62 | */ |
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63 | View Code Duplication | public function validate() |
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71 | } |
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72 |
This check looks for multiple assignments in successive lines of code. It will report an issue if the operators are not in a straight line.
To visualize
will produce issues in the first and second line, while this second example
will produce no issues.