(PHP 5 >= 5.1.0, PHP 7)
FilterIterator::valid — Check whether the current element is valid
public FilterIterator::valid ( ) : bool
This function is currently not documented; only its argument list is available.
Checks whether the current element is valid.
This function has no parameters.
true if the current element is valid, otherwise false
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https://www.php.net/manual/en/filteriterator.valid.php