/**
* Return the key of the current element
* @return null|int
*/
public function key()
{
return $this->valid() ? $this->current->getIntValue() : null;
}
/**
* @param IP $ip
* @return bool
*/
public function includesIP(IP $ip)
{
return $this->start->getIntValue() <= $ip->getIntValue() && $this->end->getIntValue() >= $ip->getIntValue();
}