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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| 16 | class PurchaseRequestTest extends TestCase  | 
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| 17 | { | 
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| 18 | private $request;  | 
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| 19 | |||
| 20 | private $purse = '[email protected]';  | 
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| 21 | private $secret = '22SAD#-78G888';  | 
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| 22 | private $returnUrl = 'https://www.foodstore.com/success';  | 
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| 23 | private $cancelUrl = 'https://www.foodstore.com/failure';  | 
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| 24 | private $notifyUrl = 'https://www.foodstore.com/notify';  | 
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| 25 | private $description = 'Test Transaction long description';  | 
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| 26 | private $transactionId = '12345ASD67890sd';  | 
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| 27 | private $sum = '1.65';  | 
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| 28 | private $amount = '14.65';  | 
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| 29 | private $quantity = '1';  | 
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| 30 | private $currency = 'USD';  | 
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| 31 | private $testMode = true;  | 
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| 32 | |||
| 33 | View Code Duplication | public function setUp()  | 
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| 52 | |||
| 53 | View Code Duplication | public function testGetData()  | 
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| 65 | |||
| 66 | public function testSendData()  | 
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| 72 | }  | 
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| 73 | 
This check marks private properties in classes that are never used. Those properties can be removed.