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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14 | class UserController extends Controller |
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15 | { |
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16 | /** |
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17 | * Constructor |
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18 | */ |
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19 | public function __construct() |
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30 | |||
31 | /** |
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32 | * Show all the users. |
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33 | * |
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34 | * @return \Illuminate\View\View |
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35 | */ |
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36 | public function index(): View |
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40 | |||
41 | /** |
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42 | * Show the user profile page. |
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43 | * |
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44 | * @return \Illuminate\Http\RedirectResponse|\Illuminate\View\View |
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45 | */ |
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46 | public function show(Request $request, $slug, $id) |
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69 | |||
70 | /** |
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71 | * Show the settings form. |
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72 | * |
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73 | * @return \Illuminate\View\View |
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74 | */ |
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75 | public function showSettingsForm(): View |
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83 | |||
84 | /** |
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85 | * Handle an update request for the user. |
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86 | * |
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87 | * @param \Illuminate\Http\Request $request |
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88 | * |
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89 | * @return \Illuminate\Http\RedirectResponse |
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90 | */ |
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91 | public function update(Request $request): RedirectResponse |
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111 | |||
112 | /** |
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113 | * Handle the delete request for the user. |
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114 | * |
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115 | * @param \Illuminate\Http\Request $request |
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116 | * |
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117 | * @return \Illuminate\Http\RedirectResponse |
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118 | */ |
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119 | public function delete(Request $request): RedirectResponse |
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140 | |||
141 | /** |
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142 | * Handle a E-mail update request for the user. |
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143 | * |
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144 | * @param \Illuminate\Http\Request $request |
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145 | * |
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146 | * @return \Illuminate\Http\RedirectResponse |
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147 | */ |
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148 | protected function updateEmail(Request $request): RedirectResponse |
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157 | |||
158 | /** |
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159 | * Handle a Password update request for the user. |
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160 | * |
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161 | * @param \Illuminate\Http\Request $request |
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162 | * |
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163 | * @return \Illuminate\Http\RedirectResponse |
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164 | */ |
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165 | protected function updatePassword(Request $request): RedirectResponse |
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182 | } |
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183 |
This checks looks for assignemnts to variables using the
list(...)
function, where not all assigned variables are subsequently used.Consider the following code example.
Only the variables
$a
and$c
are used. There was no need to assign$b
.Instead, the list call could have been.