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  | 
            ||
| 9 | class xsDayTimeDurationTest extends \PHPUnit_Framework_TestCase  | 
            ||
| 10 | { | 
            ||
| 11 | /**  | 
            ||
| 12 | * Sets up the fixture, for example, opens a network connection.  | 
            ||
| 13 | * This method is called before a test is executed.  | 
            ||
| 14 | */  | 
            ||
| 15 | protected function setUp()  | 
            ||
| 19 | |||
| 20 | /**  | 
            ||
| 21 | * Tears down the fixture, for example, closes a network connection.  | 
            ||
| 22 | * This method is called after a test is executed.  | 
            ||
| 23 | */  | 
            ||
| 24 | protected function tearDown()  | 
            ||
| 28 | |||
| 29 | /**  | 
            ||
| 30 | * @dataProvider testxsDayTimeDurationValidDataProvider  | 
            ||
| 31 | */  | 
            ||
| 32 | public function testxsDayTimeDurationValid($input, $message)  | 
            ||
| 41 | |||
| 42 | public function testxsDayTimeDurationValidDataProvider()  | 
            ||
| 55 | |||
| 56 | /**  | 
            ||
| 57 | * @dataProvider testxsDayTimeDurationInvalidDataProvider  | 
            ||
| 58 | */  | 
            ||
| 59 | View Code Duplication | public function testxsDayTimeDurationInvalid($input, $message)  | 
            |
| 69 | |||
| 70 | public function testxsDayTimeDurationInvalidDataProvider()  | 
            ||
| 85 | }  | 
            ||
| 86 | 
This check looks for variable assignements that are either overwritten by other assignments or where the variable is not used subsequently.
Both the
$myVarassignment in line 1 and the$higherassignment in line 2 are dead. The first because$myVaris never used and the second because$higheris always overwritten for every possible time line.