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This article mainly introduces the relevant knowledge of "how to use php packaging iterator". The editor shows you the operation process through an actual case. The operation method is simple and fast, and it is practical. I hope this article "how to use php packaging iterator" can help you solve the problem.

1. It is also an iterator, and when it is instantiated, it needs to be passed to another iterator for internal storage, that is, the internal iterative InnerIterator.

2. The original iterator function can be upgraded by inheriting IteratorIterator.

The construction parameter must also be an iterator, and the parameter signature itself requires an object that implements the Traversable interface.

Example

Class OutIterator extends IteratorIterator {public function rewind () {echo _ METHOD__, PHP_EOL; return parent::rewind ();} public function valid () {echo _ METHOD__, PHP_EOL; return parent::valid ();} public function current () {echo _ METHOD__, PHP_EOL; return parent::current (). '_ suffix';} public function key () {echo _ METHOD__, PHP_EOL; return parent::key ();} public function next () {echo _ METHOD__, PHP_EOL; return parent::next ();} public function getInnerIterator () {echo _ METHOD__, PHP_EOL; return parent::getInnerIterator () }} $iterator = new OutIterator (new ArrayIterator ([1,2,3])); foreach ($iterator as $k = > $v) {echo $k,':', $v, PHP_EOL } / / OutIterator::rewind// OutIterator::valid// OutIterator::current// OutIterator::key// 0: 1_suffix// OutIterator::next// OutIterator::valid// OutIterator::current// OutIterator::key// 1: 2_suffix// OutIterator::next// OutIterator::valid// OutIterator::current// OutIterator::key// 2: 3_suffix// OutIterator::next// OutIterator::valid 's content on "how to use the php wrapper iterator" ends here Thank you for your reading. If you want to know more about the industry, you can follow the industry information channel. The editor will update different knowledge points for you every day.

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