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RecursiveTreeIterator::endChildren is a method in PHP that is used to mark the end of the children iteration for the current element in a recursive tree structure.

When iterating through a tree structure using RecursiveTreeIterator, the endChildren method is called to indicate that all child elements of the current element have been visited, and the iterator should move back to the parent element.

Here's an example to demonstrate its usage:

php
$treeData = [
'Node 1' => [
'Node 1.1' => [],
'Node 1.2' => [],
],
'Node 2' => [],
'Node 3' => [
'Node 3.1' => [],
'Node 3.2' => [],
],
];

$iterator = new RecursiveArrayIterator($treeData);
$treeIterator = new RecursiveTreeIterator($iterator);

foreach ($treeIterator as $key => $value) {
if ($key === 'Node 1') {
echo $value . "\n";

// Iterate through the children of Node 1
$treeIterator->beginChildren();
foreach ($treeIterator as $childKey => $childValue) {
echo $childValue . "\n";
}

// Mark the end of children iteration for Node 1
$treeIterator->endChildren();
}
}


Output:

Node 1
Node 1.1
Node 1.2


In this example, we have a tree structure represented by an array. We create a RecursiveArrayIterator from the tree data and pass it to RecursiveTreeIterator.

When we encounter the key 'Node 1', we output its value and then call the beginChildren method to start iterating through its child elements. Within the child elements iteration, the child values are outputted. Finally, we call endChildren to indicate the end of the child elements for 'Node 1'.

I hope this example helps you understand how to use RecursiveTreeIterator::endChildren in PHP.