RawLayout.php
public function getHierarchyIterator($id)
    {
        $id       = $this->validateAndResolveId($id);
        $children = $this->hierarchy->get($this->getProperty($id, self::PATH, true));

        return new HierarchyIterator($id, $children);
    }
public function getHierarchyIterator($id)
    {
        $id       = $this->validateAndResolveId($id);
        $children = $this->hierarchy->get($this->getProperty($id, self::PATH, true));

        return new HierarchyIterator($id, $children);
    }
public function getHierarchyIterator ( $ id ) { $ id = $ this -> validateAndResolveId ( $ id ) ; $ children = $ this -> hierarchy -> get ( $ this -> getProperty ( $ id , self :: PATH , true ) ) ; return new HierarchyIterator ( $ id , $ children ) ; }
Returns an iterator which can be used to get ids of all children of the given item
The iteration is performed from parent to child

@param string $id The id or alias of the layout item

@return HierarchyIterator

@throws Exception\InvalidArgumentException if the id is empty
@throws Exception\ItemNotFoundException if the layout item does not exist
Returns an iterator which can be used to get ids of all children of the given item The iteration is performed from parent to child