/**
* Returns whether or not the iterator has more elements
*
* @return bool
*/
public function valid()
{
if ($this->_buffer->offsetExists($this->_index)) {
$current = $this->_buffer->offsetGet($this->_index);
$this->_current = $current['value'];
$this->_key = $current['key'];
return true;
}
$valid = parent::valid();
if ($valid) {
$this->_current = parent::current();
$this->_key = parent::key();
$this->_buffer->push(['key' => $this->_key, 'value' => $this->_current]);
}
$this->_finished = !$valid;
return $valid;
}