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  | 
            ||
| 5 | class ArrayDotCollectionTest extends PHPUnit_Framework_TestCase  | 
            ||
| 
                                                                                                    
                        
                         | 
                |||
| 6 | { | 
            ||
| 7 | public function test_collection_gets_null_on_non_existent_path()  | 
            ||
| 16 | |||
| 17 | View Code Duplication | public function test_collection_gets_shallow_path_value()  | 
            |
| 28 | |||
| 29 | View Code Duplication | public function test_collection_gets_nested_path_value()  | 
            |
| 42 | |||
| 43 | View Code Duplication | public function test_collection_gets_deep_nested_path_value()  | 
            |
| 60 | |||
| 61 | View Code Duplication | public function test_collection_gets_nested_path_with_numeric_keys_value()  | 
            |
| 76 | }  | 
            ||
| 77 | 
You can fix this by adding a namespace to your class:
When choosing a vendor namespace, try to pick something that is not too generic to avoid conflicts with other libraries.