- var_dump: documentation ( source)
<?php
$arr = new RecursiveArrayIterator(['test1', ['test2', 'test3']]);
$regex = new RecursiveRegexIterator($arr, '/^test/', RecursiveRegexIterator::ALL_MATCHES, 1, 2);
$regex->next();
$child = $regex->getChildren();
var_dump(get_class($child), $child->getMode(), $child->getFlags(), $child->getPregFlags());