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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| 7 | abstract class DataSetChart extends Chart { |
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| 8 | |||
| 9 | /** @var null|string[] */ |
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| 10 | private $labels; |
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| 11 | |||
| 12 | /** @var DataSet[] */ |
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| 13 | private $dataSets = []; |
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| 14 | |||
| 15 | /** |
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| 16 | * LineChart constructor. |
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| 17 | * @param null|string[] $labels |
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| 18 | * @param DataSet[] $dataSets |
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| 19 | */ |
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| 20 | public function __construct(array $labels = null, array $dataSets = []) { |
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| 25 | |||
| 26 | public function data() { |
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| 43 | |||
| 44 | /** |
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| 45 | * @return null|string[] |
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| 46 | */ |
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| 47 | public function getLabels() { |
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| 50 | |||
| 51 | /** |
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| 52 | * @return DataSet[] |
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| 53 | */ |
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| 54 | public function getDataSets() { |
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| 57 | |||
| 58 | /** |
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| 59 | * @param DataSet $set |
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| 60 | * @return $this |
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| 61 | */ |
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| 62 | public function addDataSet(DataSet $set) { |
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| 66 | |||
| 67 | private function makeLabels() { |
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| 78 | |||
| 79 | } |
This check marks implicit conversions of arrays to boolean values in a comparison. While in PHP an empty array is considered to be equal (but not identical) to false, this is not always apparent.
Consider making the comparison explicit by using
empty(..)or! empty(...)instead.