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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| 8 | trait HasGatewaySpecificFields |
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| 9 | {
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| 10 | protected $gatewaySpecificFieldsConfig = array( |
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| 11 | 'test' => array( |
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| 12 | 'required' => array(), |
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| 13 | 'optional' => array(), |
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| 14 | ), |
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| 15 | 'fake' => array( |
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| 16 | 'required' => array( |
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| 17 | 'foo', |
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| 18 | ), |
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| 19 | 'optional' => array( |
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| 20 | 'bar', |
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| 21 | ), |
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| 22 | ), |
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| 23 | 'conekta' => array( |
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| 24 | 'required' => array(), |
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| 25 | 'optional' => array( |
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| 26 | 'device_fingerprint', |
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| 27 | 'customer', |
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| 28 | 'phone', |
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| 29 | ), |
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| 30 | ), |
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| 31 | ); |
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| 32 | |||
| 33 | 18 | public function getGatewaySpecificFields() |
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| 37 | |||
| 38 | 2 | public function setGatewaySpecificFields($value) |
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| 42 | |||
| 43 | /** |
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| 44 | * @param array $data |
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| 45 | * @return array |
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| 46 | * @throws InvalidRequestException |
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| 47 | */ |
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| 48 | 18 | protected function fillGatewaySpecificFields($data) |
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| 72 | } |
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| 73 |
This check looks for methods that are used by a trait but not required by it.
To illustrate, let’s look at the following code example
The trait
Idableprovides a methodequalsIdthat in turn relies on the methodgetId(). If this method does not exist on a class mixing in this trait, the method will fail.Adding the
getId()as an abstract method to the trait will make sure it is available.