/**
* Merges this navigation item with the other parameter and returns a new NavigationItem.
* Works only if there are no duplicate values on one level.
* @param NavigationItem $other The navigation item this one should be merged with
* @return NavigationItem
*/
public function merge(NavigationItem $other = null)
{
// Create new item
$new = $this->copyChildless();
// Add all children from this item
foreach ($this->getChildren() as $child) {
/** @var NavigationItem $child */
$new->addChild($child->merge($other != null ? $other->findChildren($child) : null));
}
// Add all children from the other item
if ($other != null) {
foreach ($other->getChildren() as $child) {
/** @var NavigationItem $child */
if (!$new->find($child)) {
$new->addChild($child->merge($this->copyChildless()));
}
}
}
return $new;
}
