| 1 | <?php |
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| 8 | trait IteratorTrait |
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| 9 | { |
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| 10 | private $container; |
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| 11 | |||
| 12 | protected function getData() |
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| 21 | |||
| 22 | protected $position = 0; |
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| 23 | |||
| 24 | public function key() |
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| 28 | |||
| 29 | public function current() |
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| 33 | |||
| 34 | public function next() |
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| 38 | |||
| 39 | public function prev() |
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| 43 | |||
| 44 | public function rewind() |
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| 48 | |||
| 49 | public function valid() |
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| 53 | |||
| 54 | public function seek($position) |
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| 62 | } |
This check looks for methods that are used by a trait but not required by it.
To illustrate, let’s look at the following code example
The trait
Idableprovides a methodequalsIdthat in turn relies on the methodgetId(). If this method does not exist on a class mixing in this trait, the method will fail.Adding the
getId()as an abstract method to the trait will make sure it is available.