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 declare(strict_types=1); |
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8 | class ArgumentsBuilder |
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9 | { |
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10 | /** |
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11 | * @var ContainerInterface |
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12 | */ |
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13 | protected $container; |
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14 | |||
15 | 48 | public function setContainer(ContainerInterface $container): void |
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19 | |||
20 | /** |
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21 | * Build arguments by dependencies and parameters |
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22 | * |
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23 | * @param DependencyInterface[] $dependencies |
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24 | * @param ParameterInterface[] $parameters |
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25 | * @return array |
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26 | * @throws NotFoundException |
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27 | */ |
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28 | 41 | public function buildArguments(array $dependencies, array $parameters): array |
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40 | |||
41 | /** |
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42 | * @param DependencyInterface[] $dependencies |
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43 | * @param ParameterInterface[] $parameters |
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44 | * @return array |
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45 | * @throws NotFoundException |
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46 | */ |
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47 | 33 | protected function buildArgumentsFromDependencies(array $dependencies, array $parameters): array |
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72 | |||
73 | |||
74 | /** |
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75 | * @param array $parameters |
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76 | * @param array $usedParameters |
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77 | * @param array $arguments |
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78 | * @return array |
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79 | * @throws NotFoundException |
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80 | */ |
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81 | 30 | protected function appendUnusedParamsToArguments( |
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93 | |||
94 | /** |
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95 | * @param ParameterInterface $parameter |
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96 | * @return mixed |
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97 | * @throws NotFoundException |
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98 | */ |
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99 | 18 | View Code Duplication | protected function makeArgumentByParameter(ParameterInterface $parameter) |
110 | |||
111 | /** |
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112 | * @param DependencyInterface $dependency |
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113 | * @return mixed |
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114 | * @throws NotFoundException |
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115 | */ |
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116 | 25 | View Code Duplication | protected function makeArgumentByDependency(DependencyInterface $dependency) |
127 | |||
128 | /** |
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129 | * @param $id |
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130 | * @return mixed |
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131 | * @throws NotFoundException |
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132 | */ |
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133 | 23 | protected function retrieveRequiredDependencyFromContainer($id) |
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140 | |||
141 | /** |
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142 | * @param $id |
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143 | * @return mixed |
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144 | */ |
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145 | 4 | protected function retrieveOptionalDependencyFromContainer($id) |
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152 | } |
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153 |
This check looks for variable assignements that are either overwritten by other assignments or where the variable is not used subsequently.
Both the
$myVar
assignment in line 1 and the$higher
assignment in line 2 are dead. The first because$myVar
is never used and the second because$higher
is always overwritten for every possible time line.