(PHP 5 >= 5.3.0, PHP 7)
MultipleIterator::containsIterator — Checks if an iterator is attached
public MultipleIterator::containsIterator ( Iterator $iterator ) : bool
Checks if an iterator is attached or not.
This function is currently not documented; only its argument list is available.
iterator
The iterator to check.
Returns true on success or false on failure.
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https://www.php.net/manual/en/multipleiterator.containsiterator.php