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 | trait VectorLikeTrait |
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8 | { |
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9 | use ConstVectorLikeTrait, |
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10 | CommonMutableContainerTrait; |
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11 | |||
12 | /** |
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13 | * identical to at, implemented for ArrayAccess |
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14 | */ |
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15 | public function offsetGet($offset) |
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19 | |||
20 | public function offsetSet($offset, $value) |
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28 | |||
29 | public function offsetUnset($offset) |
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33 | |||
34 | /** |
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35 | * Stores a value into the Vector with the specified key, overwriting the |
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36 | * previous value associated with the key. If the key is not present, |
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37 | * an exception is thrown. "$vec->set($k,$v)" is semantically equivalent |
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38 | * to "$vec[$k] = $v" (except that set() returns the Vector). |
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39 | * |
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40 | * @param $key |
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41 | * @param $value |
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42 | * @return $this |
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43 | */ |
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44 | public function set($key, $value) |
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51 | |||
52 | /** |
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53 | * {@inheritdoc} |
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54 | */ |
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55 | View Code Duplication | public function setAll($items) |
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68 | |||
69 | /** |
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70 | * {@inheritdoc} |
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71 | */ |
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72 | public function add($item) |
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78 | |||
79 | /** |
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80 | * {@inheritdoc} |
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81 | */ |
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82 | public function removeKey($key) |
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91 | |||
92 | /** |
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93 | * {@inheritdoc} |
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94 | */ |
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95 | public function splice($offset, $length = null) |
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112 | |||
113 | /** |
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114 | * {@inheritDoc} |
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115 | * @return $this |
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116 | */ |
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117 | public function each(callable $callable) |
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125 | } |
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126 |
This check looks from parameters that have been defined for a function or method, but which are not used in the method body.