src/precore/util/Iterators.php
public static function from(Traversable $traversable) : Iterator
    {
        Preconditions::checkArgument($traversable instanceof Iterator || $traversable instanceof IteratorAggregate);
        return $traversable instanceof Iterator
            ? $traversable
            : Iterators::from($traversable->getIterator());
    }
public static function from(Traversable $traversable) : Iterator
    {
        Preconditions::checkArgument($traversable instanceof Iterator || $traversable instanceof IteratorAggregate);
        return $traversable instanceof Iterator
            ? $traversable
            : Iterators::from($traversable->getIterator());
    }
public static function from ( Traversable $ traversable ) : Iterator { Preconditions :: checkArgument ( $ traversable instanceof Iterator || $ traversable instanceof IteratorAggregate ) ; return $ traversable instanceof Iterator ? $ traversable : Iterators :: from ( $ traversable -> getIterator ( ) ) ; }
Returns an iterator for the given traversable.

@param Traversable $traversable
@return Iterator
Returns an iterator for the given traversable .