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:
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| 9 | class Class_Const_Missing extends PersistentListItem implements Invocation_Warner { |
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| 10 | public $declaration; |
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| 12 | function __construct( $declaration ) { |
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| 16 | function to_csv_array() { |
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| 25 | public function type() { |
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| 29 | View Code Duplication | public function find_invocation_warnings( $invocation, $warnings ) { |
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| 37 | } |
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