(PHP 5 >= 5.3.0, PHP 7)
RecursiveTreeIterator::valid — Check validity
public RecursiveTreeIterator::valid ( ) : bool
Check whether the current position is valid.
This function is currently not documented; only its argument list is available.
This function has no parameters.
true if the current position is valid, otherwise false
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https://www.php.net/manual/en/recursivetreeiterator.valid.php