(PHP 5 >= 5.1.0, PHP 7)
RecursiveIteratorIterator::callHasChildren — Has children
public RecursiveIteratorIterator::callHasChildren ( ) : bool
Called for each element to test whether it has children.
This function is currently not documented; only its argument list is available.
This function has no parameters.
true if the element has children, otherwise false
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https://www.php.net/manual/en/recursiveiteratoriterator.callhaschildren.php