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 | |||
13 | const OPTIONAL = false; |
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14 | const REQUIRED = true; |
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15 | |||
16 | /** |
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17 | * @var string |
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18 | */ |
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19 | private $type; |
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20 | |||
21 | /** |
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22 | * @var string |
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23 | */ |
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24 | private $key; |
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25 | |||
26 | /** |
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27 | * @var bool |
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28 | */ |
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29 | private $required; |
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30 | |||
31 | /** |
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32 | * @var array|null |
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33 | */ |
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34 | private $availableValues; |
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35 | |||
36 | /** |
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37 | * @var bool |
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38 | */ |
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39 | private $multi; |
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40 | |||
41 | 36 | public function __construct($type, $key, $required = self::OPTIONAL, $availableValues = null, $multi = false) |
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42 | { |
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43 | 36 | $this->type = $type; |
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44 | 36 | $this->key = $key; |
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45 | 36 | $this->required = $required; |
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46 | 36 | $this->availableValues = $availableValues; |
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47 | 36 | $this->multi = $multi; |
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48 | 36 | } |
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49 | |||
50 | /** |
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51 | * @return string |
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52 | */ |
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53 | 9 | public function getType() |
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57 | |||
58 | /** |
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59 | * @return string |
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60 | */ |
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61 | 18 | public function getKey() |
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65 | |||
66 | /** |
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67 | * @return boolean |
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68 | */ |
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69 | 6 | public function isRequired() |
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73 | |||
74 | 6 | public function getAvailableValues() |
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78 | |||
79 | /** |
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80 | * @return bool |
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81 | */ |
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82 | 18 | public function isMulti() |
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86 | |||
87 | /** |
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88 | * Check if actual value from environment is valid |
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89 | * |
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90 | * @return bool |
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91 | * |
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92 | * @throws Exception if actual InputParam has unsupported type |
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93 | */ |
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94 | 15 | public function isValid() |
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113 | |||
114 | /** |
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115 | * Process environment variables like POST|GET|etc.. and return actual value |
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116 | * |
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117 | * @return mixed |
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118 | * |
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119 | * @throws Exception if actual InputParam has unsupported type |
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120 | */ |
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121 | 27 | public function getValue() |
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154 | |||
155 | 3 | private function processMultiFileUploads($files) |
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165 | } |
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166 |
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: