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 | class InputParam implements ParamInterface |
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8 | { |
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9 | const TYPE_POST = 'POST'; |
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10 | const TYPE_GET = 'GET'; |
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11 | const TYPE_FILE = 'FILE'; |
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12 | const TYPE_COOKIE = 'COOKIE'; |
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13 | |||
14 | const OPTIONAL = false; |
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15 | const REQUIRED = true; |
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16 | |||
17 | /** |
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18 | * @var string |
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19 | */ |
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20 | private $type; |
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21 | |||
22 | /** |
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23 | * @var string |
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24 | */ |
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25 | private $key; |
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26 | |||
27 | /** |
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28 | * @var bool |
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29 | */ |
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30 | private $required; |
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31 | |||
32 | /** |
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33 | * @var array|null |
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34 | */ |
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35 | private $availableValues; |
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36 | |||
37 | /** |
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38 | * @var bool |
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39 | */ |
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40 | private $multi; |
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41 | |||
42 | 39 | public function __construct($type, $key, $required = self::OPTIONAL, $availableValues = null, $multi = false) |
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50 | |||
51 | /** |
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52 | * @return string |
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53 | */ |
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54 | 9 | public function getType() |
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58 | |||
59 | /** |
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60 | * @return string |
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61 | */ |
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62 | 18 | public function getKey() |
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66 | |||
67 | /** |
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68 | * @return boolean |
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69 | */ |
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70 | 6 | public function isRequired() |
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74 | |||
75 | 6 | public function getAvailableValues() |
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79 | |||
80 | /** |
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81 | * @return bool |
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82 | */ |
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83 | 18 | public function isMulti() |
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87 | |||
88 | /** |
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89 | * Check if actual value from environment is valid |
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90 | * |
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91 | * @return bool |
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92 | * |
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93 | * @throws Exception if actual InputParam has unsupported type |
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94 | */ |
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95 | 15 | public function isValid() |
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114 | |||
115 | /** |
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116 | * Process environment variables like POST|GET|etc.. and return actual value |
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117 | * |
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118 | * @return mixed |
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119 | * |
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120 | * @throws Exception if actual InputParam has unsupported type |
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121 | */ |
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122 | 30 | public function getValue() |
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160 | |||
161 | 3 | private function processMultiFileUploads($files) |
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171 | } |
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172 |
Instead of super-globals, we recommend to explicitly inject the dependencies of your class. This makes your code less dependent on global state and it becomes generally more testable: