(PHP 5 >= 5.1.3, PHP 7)
RecursiveIteratorIterator::__construct — Construct a RecursiveIteratorIterator
public RecursiveIteratorIterator::__construct ( Traversable $iterator [, int $mode = RecursiveIteratorIterator::LEAVES_ONLY [, int $flags = 0 ]] )
Creates a RecursiveIteratorIterator from a RecursiveIterator.
iterator
The iterator being constructed from. Either a RecursiveIterator or IteratorAggregate.
mode
Optional mode. Possible values are
RecursiveIteratorIterator::LEAVES_ONLY
- The default. Lists only leaves in iteration. RecursiveIteratorIterator::SELF_FIRST
- Lists leaves and parents in iteration with parents coming first. RecursiveIteratorIterator::CHILD_FIRST
- Lists leaves and parents in iteration with leaves coming first. flags
Optional flag. Possible values are RecursiveIteratorIterator::CATCH_GET_CHILD
which will then ignore exceptions thrown in calls to RecursiveIteratorIterator::getChildren().
No value is returned.
Example #1 Iterating a RecursiveIteratorIterator
<?php $array = array( array( array( array( 'leaf-0-0-0-0', 'leaf-0-0-0-1' ), 'leaf-0-0-0' ), array( array( 'leaf-0-1-0-0', 'leaf-0-1-0-1' ), 'leaf-0-1-0' ), 'leaf-0-0' ) ); $iterator = new RecursiveIteratorIterator( new RecursiveArrayIterator($array), $mode ); foreach ($iterator as $key => $leaf) { echo "$key => $leaf", PHP_EOL; } ?>
Output with $mode = RecursiveIteratorIterator::LEAVES_ONLY
0 => leaf-0-0-0-0 1 => leaf-0-0-0-1 0 => leaf-0-0-0 0 => leaf-0-1-0-0 1 => leaf-0-1-0-1 0 => leaf-0-1-0 0 => leaf-0-0
Output with $mode = RecursiveIteratorIterator::SELF_FIRST
0 => Array 0 => Array 0 => Array 0 => leaf-0-0-0-0 1 => leaf-0-0-0-1 1 => leaf-0-0-0 1 => Array 0 => Array 0 => leaf-0-1-0-0 1 => leaf-0-1-0-1 1 => leaf-0-1-0 2 => leaf-0-0
Output with $mode = RecursiveIteratorIterator::CHILD_FIRST
0 => leaf-0-0-0-0 1 => leaf-0-0-0-1 0 => Array 1 => leaf-0-0-0 0 => Array 0 => leaf-0-1-0-0 1 => leaf-0-1-0-1 0 => Array 1 => leaf-0-1-0 1 => Array 2 => leaf-0-0 0 => Array
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https://www.php.net/manual/en/recursiveiteratoriterator.construct.php