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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10 | class Order |
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11 | { |
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12 | const ASCENDING = 'asc'; |
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13 | const DESCENDING = 'desc'; |
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14 | const ASC = 'asc'; |
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15 | const DESC = 'desc'; |
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16 | |||
17 | /** |
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18 | * @var string |
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19 | */ |
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20 | protected $column; |
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21 | |||
22 | /** |
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23 | * @var string |
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24 | */ |
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25 | protected $order; |
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26 | |||
27 | /** |
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28 | * @param string[][] $orders |
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29 | * @return Order[] |
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30 | */ |
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31 | 17 | public static function createMany(array $orders) |
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37 | |||
38 | /** |
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39 | * Order constructor. |
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40 | * |
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41 | * @param string $column |
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42 | * @param string $order |
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43 | */ |
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44 | 17 | public function __construct($column, $order) |
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49 | |||
50 | /** |
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51 | * @param $order |
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52 | * @return string |
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53 | */ |
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54 | 17 | View Code Duplication | protected static function validate($order) |
62 | |||
63 | /** |
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64 | * @return array |
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65 | */ |
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66 | 17 | public function toArray() |
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70 | |||
71 | /** |
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72 | * @return string |
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73 | */ |
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74 | 10 | public function column() |
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78 | |||
79 | /** |
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80 | * @return string |
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81 | */ |
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82 | 10 | public function order() |
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86 | |||
87 | /** |
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88 | * @return bool |
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89 | */ |
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90 | public function ascending() |
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94 | |||
95 | /** |
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96 | * @return bool |
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97 | */ |
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98 | public function descending() |
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102 | |||
103 | /** |
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104 | * @return static |
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105 | */ |
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106 | 12 | public function inverse() |
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110 | } |
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111 |
This check looks for function calls that miss required arguments.