/**
* Checks if current position is valid.
*
* @return bool Returns true on success, false otherwise
*/
public function valid()
{
if (is_null($this->current)) {
return !empty($this->branch);
}
if ($this->current instanceof RecursiveLeafInterface) {
return $this->current->valid();
}
return false;
}
/**
* For a callable, it's always valid to iterate
*
* @return bool
*/
public function valid()
{
return $this->generator ? $this->generator->valid() : true;
}