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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5 | class Warnings extends PersistentList { |
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6 | public function generate( $invocations, $differences ) { |
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18 | View Code Duplication | public function summary() { |
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44 | } |