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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12 | class Marker_Model extends Model_Base { |
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14 | /** |
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15 | * @var \Clubdeuce\WPGoogleMaps\Marker |
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16 | */ |
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17 | protected $_marker; |
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19 | /** |
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20 | * @return bool |
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21 | */ |
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22 | 1 | function has_marker() { |
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24 | 1 | return $this->_has( '_marker' ); |
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26 | } |
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27 | |||
28 | /** |
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29 | * @return Location |
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30 | */ |
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31 | 2 | function location() { |
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36 | |||
37 | /** |
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38 | * @return Marker_Label |
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39 | */ |
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40 | 1 | function label() { |
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46 | /** |
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47 | * @return Info_Window |
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48 | */ |
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49 | 1 | function info_window() { |
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54 | |||
55 | /** |
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56 | * @param string $method_name |
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57 | * @param array $args |
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58 | * |
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59 | * @return mixed|null |
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60 | */ |
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61 | 1 | View Code Duplication | function __call( $method_name, $args ) { |
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82 | } |
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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: