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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| 5 | class RoutingNormalizer |
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| 6 | { |
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| 7 | /** |
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| 8 | * Normalizes string and array declarations into associative array. |
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| 9 | * |
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| 10 | * @param string|array $declaration |
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| 11 | * |
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| 12 | * @return array |
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| 13 | */ |
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| 14 | public function normalizeDeclaration($declaration) |
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| 15 | { |
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| 16 | if (is_string($declaration)) { |
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| 17 | return $this->normalizeString($declaration); |
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| 18 | } |
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| 19 | |||
| 20 | // Normalize numerically indexed array |
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| 21 | if (array_keys($declaration) === array_keys(array_values($declaration))) { |
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| 22 | return $this->normalizeArray($declaration); |
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| 23 | } |
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| 24 | |||
| 25 | View Code Duplication | if (isset($declaration['arguments']) && !is_array($declaration['arguments'])) { |
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| 26 | throw new \InvalidArgumentException('The "arguments" parameter should be an array of arguments.'); |
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| 27 | } |
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| 28 | |||
| 29 | // Adds default value to associative array |
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| 30 | return array_merge(['method' => null, 'required' => true, 'arguments' => []], $declaration); |
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| 31 | } |
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| 32 | |||
| 33 | private function normalizeString($declaration) |
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| 34 | { |
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| 35 | $service = $declaration; |
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| 36 | $method = null; |
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| 37 | |||
| 38 | View Code Duplication | if (strpos($declaration, ':') !== false) { |
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| 39 | list($service, $method) = explode(':', $declaration); |
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| 40 | } |
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| 41 | |||
| 42 | return [ |
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| 43 | 'service' => $service, |
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| 44 | 'method' => $method, |
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| 45 | 'arguments' => [], |
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| 46 | 'required' => true, |
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| 47 | ]; |
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| 48 | } |
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| 49 | |||
| 50 | private function normalizeArray($declaration) |
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| 70 | } |
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| 71 |
This check looks for the generic type
arrayas a return type and suggests a more specific type. This type is inferred from the actual code.