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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| 18 | class Info_Window_Model extends Model_Base { |
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| 19 | |||
| 20 | /** |
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| 21 | * @var \Clubdeuce\WPGoogleMaps\Info_Window |
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| 22 | */ |
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| 23 | protected $_info_window; |
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| 24 | |||
| 25 | /** |
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| 26 | * Info_Window constructor. |
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| 27 | * |
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| 28 | * @param array $args |
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| 29 | */ |
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| 30 | function __construct( $args = array() ) { |
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| 31 | |||
| 32 | $args = wp_parse_args( $args, array( |
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| 33 | 'info_window' => new \Clubdeuce\WPGoogleMaps\Info_Window( $args ), |
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| 34 | 1 | ) ); |
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| 35 | |||
| 36 | 1 | parent::__construct( $args ); |
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| 37 | |||
| 38 | } |
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| 39 | |||
| 40 | /** |
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| 41 | * @return bool |
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| 42 | */ |
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| 43 | 1 | function has_info_window() { |
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| 48 | |||
| 49 | /** |
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| 50 | * @param string $method_name |
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| 51 | * @param array $args |
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| 52 | 1 | * |
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| 53 | * @return mixed|null |
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| 54 | 1 | */ |
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| 55 | View Code Duplication | function __call( $method_name, $args ) { |
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| 75 | |||
| 76 | } |
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| 77 |
Let’s assume that you have a directory layout like this:
. |-- OtherDir | |-- Bar.php | `-- Foo.php `-- SomeDir `-- Foo.phpand let’s assume the following content of
Bar.php:If both files
OtherDir/Foo.phpandSomeDir/Foo.phpare loaded in the same runtime, you will see a PHP error such as the following:PHP Fatal error: Cannot use SomeDir\Foo as Foo because the name is already in use in OtherDir/Foo.phpHowever, as
OtherDir/Foo.phpdoes not necessarily have to be loaded and the error is only triggered if it is loaded beforeOtherDir/Bar.php, this problem might go unnoticed for a while. In order to prevent this error from surfacing, you must import the namespace with a different alias: