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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| 25 | class AllUsersIterator extends UsersIterator {
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| 26 | /** |
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| 27 | * @var UserInterface |
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| 28 | */ |
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| 29 | private $backend; |
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| 31 | public function __construct(UserInterface $backend) {
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| 35 | public function rewind() {
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| 40 | View Code Duplication | public function next() {
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| 48 | } |