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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25 | class CommentsPreload extends PreloadItem |
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26 | { |
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27 | /** |
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28 | * listen for core.include.common.classmaps |
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29 | * add any module specific class map entries |
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30 | * |
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31 | * @param mixed $args not used |
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32 | * |
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33 | * @return void |
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34 | */ |
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35 | public static function eventCoreIncludeCommonClassmaps($args) |
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43 | |||
44 | public static function eventCoreFooterStart($args) |
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49 | |||
50 | View Code Duplication | public static function eventSystemModuleUpdateConfigs(ConfigCollector $collector) |
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62 | |||
63 | View Code Duplication | public static function eventSystemModuleInstall(XoopsModule $module) |
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70 | |||
71 | /** |
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72 | * remove any comeents for module being uninstalled |
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73 | * |
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74 | * @param XoopsModule $module module object |
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75 | * |
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76 | * @return void |
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77 | */ |
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78 | View Code Duplication | public static function eventSystemModuleUninstall(XoopsModule $module) |
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85 | |||
86 | View Code Duplication | public static function eventSystemPreferencesForm(XoopsModule $module) |
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94 | } |
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95 |
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: