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 DateslotCalendar extends VacancyCalendar |
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7 | public function find() |
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21 | View Code Duplication | protected function prepare() |
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Methods can only be called on objects. This check looks for methods being called on variables that have been inferred to never be objects.