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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15 | trait TDataGridAggregationFunction |
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16 | { |
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17 | |||
18 | /** |
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19 | * @var IAggregationFunction[] |
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20 | */ |
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21 | private $aggregationFunctions = []; |
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22 | |||
23 | |||
24 | /** |
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25 | * @param string $key |
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26 | * @param IAggregationFunction $aggregationFunction |
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27 | * @return static |
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28 | */ |
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29 | public function addAggregationFunction($key, IAggregationFunction $aggregationFunction) |
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46 | |||
47 | /** |
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48 | * @param IDataSource $dataSource |
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49 | * @return void |
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50 | */ |
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51 | View Code Duplication | public function beforeDataModelFilter(IDataSource $dataSource) |
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59 | |||
60 | |||
61 | /** |
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62 | * @param IDataSource $dataSource |
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63 | * @return void |
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64 | */ |
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65 | View Code Duplication | public function afterDataModelFilter(IDataSource $dataSource) |
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73 | |||
74 | |||
75 | /** |
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76 | * @param IDataSource $dataSource |
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77 | * @return void |
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78 | */ |
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79 | View Code Duplication | public function afterDataModelPaginated(IDataSource $dataSource) |
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87 | |||
88 | |||
89 | /** |
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90 | * @return bool |
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91 | */ |
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92 | public function hasSomeAggregationFunction() |
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97 | |||
98 | /** |
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99 | * @return IAggregationFunction[] |
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100 | */ |
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101 | public function getAggregationFunctions() |
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105 | |||
106 | } |
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107 |
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: