skeeks\cms\models\behaviors\HasTrees::getTreeIds PHP Method

    public function getTreeIds()
    {
        if ($this->owner->_tree_ids === null) {
            $this->owner->_tree_ids = [];
            if ($this->owner->elementTrees) {
                $this->_tree_ids = (array) ArrayHelper::map($this->owner->elementTrees, $this->attributeTreeName, $this->attributeTreeName);
            }
            return $this->_tree_ids;
        }
        return (array) $this->_tree_ids;
    }