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The RecursiveTreeIterator::rewind method in PHP is used to reset the internal state of the iterator to the beginning.

When called, it will make the iterator forget any previous traversal and start iterating from the root node again.

Here is an example that demonstrates the usage of the RecursiveTreeIterator::rewind method:

php
<?php
$tree = array(
'Root' => array(
'Node 1',
'Node 2' => array(
'Node 2.1',
'Node 2.2',
),
'Node 3',
),
);

$iterator = new RecursiveTreeIterator(
new RecursiveArrayIterator($tree),
RecursiveTreeIterator::BYPASS_CHILDREN
);

echo "Iteration 1:\n";
foreach ($iterator as $key => $value) {
echo $value . "\n";
}

$iterator->rewind();

echo "Iteration 2:\n";
foreach ($iterator as $key => $value) {
echo $value . "\n";
}
?>


Output:

Iteration 1:
Root
Node 1
Node 2
Node 2.1
Node 2.2
Node 3
Iteration 2:
Root
Node 1
Node 2
Node 2.1
Node 2.2
Node 3


In this example, we create a simple array-based tree structure and then create a RecursiveTreeIterator to iterate over the tree. We display the nodes using a loop.

After the first iteration, we call the rewind method on the iterator, which resets its internal state. Then we iterate over the tree again, and the output is the same as in the first iteration.

Note that the RecursiveTreeIterator::rewind method can be called multiple times to repeat the iteration from the beginning.