(PHP 5 >= 5.3.0, PHP 7)
MultipleIterator::valid — Checks the validity of sub iterators
public MultipleIterator::valid ( ) : bool
Checks the validity of sub iterators.
This function is currently not documented; only its argument list is available.
This function has no parameters.
Returns true
if one or all sub iterators are valid depending on flags, otherwise false
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https://www.php.net/manual/en/multipleiterator.valid.php