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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11 | class File implements CacheInterface |
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12 | { |
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13 | use AdapterTrait; |
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14 | |||
15 | /** |
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16 | * @var string |
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17 | */ |
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18 | private $cachePath; |
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19 | |||
20 | /** |
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21 | * File constructor. |
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22 | * |
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23 | * @param $path |
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24 | * @param $ttl |
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25 | */ |
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26 | public function __construct($path, $ttl = 3600) |
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35 | |||
36 | /** |
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37 | * @param string $key |
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38 | * @param null $default |
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39 | * |
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40 | * @return bool|mixed|null |
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41 | */ |
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42 | public function get($key, $default = null) |
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75 | |||
76 | /** |
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77 | * @param string $key |
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78 | * @param mixed $value |
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79 | * @param null $ttl |
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80 | * |
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81 | * @return bool |
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82 | * |
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83 | * @throws InvalidArgumentException |
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84 | */ |
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85 | public function set($key, $value, $ttl = null) |
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107 | |||
108 | /** |
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109 | * @param string $key |
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110 | * |
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111 | * @return bool |
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112 | */ |
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113 | public function delete($key) |
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125 | |||
126 | /** |
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127 | * Remove all cache entries. |
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128 | */ |
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129 | public function clear() |
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143 | |||
144 | /** |
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145 | * @param string $key |
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146 | * |
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147 | * @return bool |
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148 | * |
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149 | * @throws InvalidArgumentException |
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150 | */ |
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151 | public function has($key) |
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157 | |||
158 | /** |
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159 | * Clean up expired cache entries. |
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160 | */ |
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161 | private function cleanExpired() |
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170 | |||
171 | /** |
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172 | * Creates writable directory in given path. |
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173 | * |
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174 | * @param $directoryPath |
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175 | * |
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176 | * @throws InvalidArgumentException |
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177 | */ |
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178 | private function createDirectory($directoryPath) |
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193 | |||
194 | /** |
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195 | * For a given cache key, obtain the absolute file path. |
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196 | * |
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197 | * @param string $key |
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198 | * |
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199 | * @return string absolute path to cache file |
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200 | */ |
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201 | private function getPath($key) |
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207 | |||
208 | /** |
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209 | * @return \RecursiveIteratorIterator |
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210 | */ |
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211 | private function getCacheFolderIterator() |
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218 | } |
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219 |
If you suppress an error, we recommend checking for the error condition explicitly: