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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13 | class MakeUser extends Command |
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14 | { |
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15 | /** |
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16 | * The name and signature of the console command. |
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17 | * |
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18 | * @var string |
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19 | */ |
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20 | protected $signature = 'make:user |
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21 | {--email= : Set the email for the new user} |
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22 | {--name= : Set the name for the new user} |
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23 | {--password= : The password to set for the new user} |
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24 | {--send-reset : Send a password reset email for the new user} |
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25 | {--fields= : Additional database fields to set on the user} |
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26 | {--force : Create the user model circumventing guarded fields} |
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27 | {--import-file= : Relative path and filename for a file to import users from. File name MUST contain the extension representing the type of file (Ex: ./path/to/file.csv)} |
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28 | '; |
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29 | |||
30 | /** |
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31 | * The console command description. |
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32 | * |
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33 | * @var string |
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34 | */ |
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35 | protected $description = 'Create new application users'; |
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36 | |||
37 | /** |
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38 | * Execute the console command. |
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39 | * |
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40 | * Handle creation of the new application user. |
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41 | * |
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42 | * @return void |
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43 | */ |
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44 | 27 | public function handle() |
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119 | |||
120 | /** |
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121 | * Determine if the given email address already exists. |
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122 | * |
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123 | * @param string $email |
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124 | * @return void |
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125 | * |
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126 | * @throws \Dyrynda\Artisan\Exceptions\MakeUserException |
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127 | */ |
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128 | 21 | private function validateEmail($email) |
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138 | |||
139 | /** |
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140 | * Return any additional database fields passed by the --fields option. |
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141 | * |
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142 | * @return array |
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143 | */ |
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144 | 7 | private function additionalFields() |
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156 | |||
157 | /** |
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158 | * Normalise the given (database) field input value. |
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159 | * |
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160 | * @param mixed $value |
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161 | * @return mixed |
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162 | */ |
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163 | 3 | private function normaliseValue($value) |
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179 | |||
180 | /** |
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181 | * Create file handler objects. |
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182 | * |
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183 | * @param string $path |
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184 | * @return BulkImportFileHandler |
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185 | * |
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186 | * @throws \Dyrynda\Artisan\Exceptions\ImportFileException |
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187 | */ |
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188 | 18 | private function fileHandlerFactory($path) : BulkImportFileHandler |
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202 | |||
203 | /** |
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204 | * Add default password to data. |
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205 | * |
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206 | * @param array $data |
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207 | * @return array |
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208 | */ |
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209 | private function setPasswords($data) |
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218 | } |
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219 |
If you define a variable conditionally, it can happen that it is not defined for all execution paths.
Let’s take a look at an example:
In the above example, the variable $x is defined if you pass “foo” or “bar” as argument for $a. However, since the switch statement has no default case statement, if you pass any other value, the variable $x would be undefined.
Available Fixes
Check for existence of the variable explicitly:
Define a default value for the variable:
Add a value for the missing path: