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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| 29 | class Extension extends BaseExtension |
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| 30 | { |
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| 31 | /** |
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| 32 | * {@inheritdoc} |
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| 33 | */ |
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| 34 | 5 | public function getAlias() |
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| 38 | |||
| 39 | /** |
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| 40 | * {@inheritdoc} |
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| 41 | */ |
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| 42 | 5 | public function getNamespace() |
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| 46 | |||
| 47 | /** |
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| 48 | * {@inheritdoc} |
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| 49 | */ |
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| 50 | public function getXsdValidationBasePath() |
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| 54 | |||
| 55 | /** |
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| 56 | * {@inheritdoc} |
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| 57 | */ |
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| 58 | 5 | public function load(array $config, ContainerBuilder $container) |
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| 89 | |||
| 90 | /** |
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| 91 | * Configure base currency. |
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| 92 | * |
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| 93 | * @param array $config Configuration parameters. |
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| 94 | * @param ContainerBuilder $container Service container. |
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| 95 | * |
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| 96 | * @return Extension $this Fluent interface. |
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| 97 | * @throws \RunOpenCode\ExchangeRate\Exception\UnknownCurrencyCodeException |
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| 98 | */ |
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| 99 | 5 | protected function configureBaseCurrency(array $config, ContainerBuilder $container) |
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| 106 | |||
| 107 | /** |
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| 108 | * Configure rates. |
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| 109 | * |
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| 110 | * @param array $config Configuration parameters. |
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| 111 | * @param ContainerBuilder $container Service container. |
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| 112 | * |
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| 113 | * @return Extension $this Fluent interface. |
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| 114 | */ |
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| 115 | 5 | protected function configureRates(array $config, ContainerBuilder $container) |
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| 142 | |||
| 143 | /** |
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| 144 | * Configure required processors. |
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| 145 | * |
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| 146 | * @param array $config Configuration parameters. |
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| 147 | * @param ContainerBuilder $container Service container. |
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| 148 | * |
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| 149 | * @return Extension $this Fluent interface. |
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| 150 | */ |
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| 151 | 5 | protected function configureRepository(array $config, ContainerBuilder $container) |
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| 156 | |||
| 157 | /** |
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| 158 | * Configure file repository. |
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| 159 | * |
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| 160 | * @param array $config Configuration parameters. |
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| 161 | * @param ContainerBuilder $container Service container. |
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| 162 | * |
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| 163 | * @return Extension $this Fluent interface. |
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| 164 | */ |
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| 165 | 5 | protected function configureFileRepository(array $config, ContainerBuilder $container) |
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| 176 | |||
| 177 | /** |
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| 178 | * Configure Doctrine Dbal repository. |
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| 179 | * |
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| 180 | * @param array $config Configuration parameters. |
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| 181 | * @param ContainerBuilder $container Service container. |
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| 182 | * |
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| 183 | * @return Extension $this Fluent interface. |
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| 184 | */ |
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| 185 | 5 | protected function configureDoctrineDbalRepository(array $config, ContainerBuilder $container) |
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| 197 | |||
| 198 | /** |
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| 199 | * Configure controller. |
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| 200 | * |
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| 201 | * @param array $config Configuration parameters. |
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| 202 | * @param ContainerBuilder $container Service container. |
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| 203 | * @return Extension $this Fluent interface. |
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| 204 | */ |
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| 205 | 5 | protected function configureController(array $config, ContainerBuilder $container) |
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| 214 | |||
| 215 | /** |
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| 216 | * Configure simple sources which does not have to be explicitly added to service container. |
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| 217 | * |
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| 218 | * @param array $config Configuration parameters. |
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| 219 | * @param ContainerBuilder $container Service container. |
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| 220 | * @return Extension $this Fluent interface. |
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| 221 | */ |
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| 222 | 5 | protected function configureSimpleSources(array $config, ContainerBuilder $container) |
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| 230 | |||
| 231 | /** |
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| 232 | * Configure "RunOpenCode\\Bundle\\ExchangeRate\\Form\\Type\\SourceType" default settings. |
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| 233 | * |
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| 234 | * @param array $config Configuration parameters. |
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| 235 | * @param ContainerBuilder $container Service container. |
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| 236 | * @return Extension $this Fluent interface. |
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| 237 | */ |
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| 238 | 5 | View Code Duplication | protected function configureSourceType(array $config, ContainerBuilder $container) |
| 250 | |||
| 251 | /** |
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| 252 | * Configure "RunOpenCode\\Bundle\\ExchangeRate\\Form\\Type\\RateTypeType" default settings. |
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| 253 | * |
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| 254 | * @param array $config Configuration parameters. |
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| 255 | * @param ContainerBuilder $container Service container. |
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| 256 | * @return Extension $this Fluent interface. |
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| 257 | */ |
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| 258 | 5 | protected function configureRateTypeType(array $config, ContainerBuilder $container) |
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| 272 | |||
| 273 | /** |
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| 274 | * Configure "RunOpenCode\\Bundle\\ExchangeRate\\Form\\Type\\CurrencyCodeType" default settings. |
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| 275 | * |
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| 276 | * @param array $config Configuration parameters. |
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| 277 | * @param ContainerBuilder $container Service container. |
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| 278 | * @return Extension $this Fluent interface. |
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| 279 | */ |
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| 280 | 5 | protected function configureCurrencyCodeType(array $config, ContainerBuilder $container) |
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| 296 | |||
| 297 | /** |
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| 298 | * Configure "RunOpenCode\\Bundle\\ExchangeRate\\Form\\Type\\ForeignCurrencyCodeType" default settings. |
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| 299 | * |
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| 300 | * @param array $config Configuration parameters. |
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| 301 | * @param ContainerBuilder $container Service container. |
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| 302 | * @return Extension $this Fluent interface. |
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| 303 | */ |
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| 304 | 5 | View Code Duplication | protected function configureForeignCurrencyCodeType(array $config, ContainerBuilder $container) |
| 318 | |||
| 319 | /** |
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| 320 | * Configure "RunOpenCode\\Bundle\\ExchangeRate\\Form\\Type\\RateType" default settings. |
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| 321 | * |
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| 322 | * @param array $config Configuration parameters. |
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| 323 | * @param ContainerBuilder $container Service container. |
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| 324 | * @return Extension $this Fluent interface. |
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| 325 | */ |
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| 326 | 5 | protected function configureRateType(array $config, ContainerBuilder $container) |
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| 332 | } |
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| 333 |
Let’s assume that you have a directory layout like this:
. |-- OtherDir | |-- Bar.php | `-- Foo.php `-- SomeDir `-- Foo.phpand let’s assume the following content of
Bar.php:If both files
OtherDir/Foo.phpandSomeDir/Foo.phpare loaded in the same runtime, you will see a PHP error such as the following:PHP Fatal error: Cannot use SomeDir\Foo as Foo because the name is already in use in OtherDir/Foo.phpHowever, as
OtherDir/Foo.phpdoes not necessarily have to be loaded and the error is only triggered if it is loaded beforeOtherDir/Bar.php, this problem might go unnoticed for a while. In order to prevent this error from surfacing, you must import the namespace with a different alias: