/**
* {@inheritDoc}
*/
public function addChild(IItem $item)
{
if ($item->equals($this)) {
throw new Exception('Item can\'t be a child to itself');
}
$this->children[] = $item;
$item->setParent($this);
if ($this instanceof OrderedItemInterface) {
usort($this->children, function ($a, $b) {
if ($a->getOrder() == $b->getOrder()) {
return 0;
}
return $a->getOrder() > $b->getOrder() ? 1 : -1;
});
}
return $this;
}
