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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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 | 1 | function __construct( $args = array() ) { |
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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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49 | /** |
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50 | * @param string $method_name |
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51 | * @param array $args |
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52 | * |
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53 | * @return mixed|null |
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54 | */ |
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55 | 3 | View Code Duplication | function __call( $method_name, $args ) { |
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76 | } |
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Let’s assume that you have a directory layout like this:
and let’s assume the following content of
Bar.php
:If both files
OtherDir/Foo.php
andSomeDir/Foo.php
are 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.php
However, as
OtherDir/Foo.php
does 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: