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 | View Code Duplication | class IsNumericString extends AbstractUnaryFunction |
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| 17 | { |
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| 18 | /** |
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| 19 | * @param mixed $input |
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| 20 | * |
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| 21 | * @return bool |
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| 22 | */ |
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| 23 | 56 | public function __invoke($input) |
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| 31 | } |
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| 32 |