Amp\Artax\ChunkingIterator::valid PHP Method

    public function valid()
    {
        if ($this->isLastChunk) {
            $isValid = $this->isLastChunk = false;
        } elseif (!($isValid = $this->iterator->valid())) {
            $this->isLastChunk = true;
            $isValid = true;
        }
        return $isValid;
    }