laravel RBAC 实现第二种方法

class RbacController extends Controller
{
        //rbac第二种方法
    public function show()
    {
        //查询出数据
    	$data = DB::SELECT("select * from rbac");

        //调用方法
    	$arr = $this->rbac($data);
    	var_dump($arr);
    }
    

    public function rbac($data,$pid = 0,$level = 0)
    {
        //定义数组
    	static $arr = [];

        //循环遍历
    	foreach ($data as $key => $v) {
    		if ($v->pid == $pid) {
    			$v->level = $v->name;
    			$arr[] = $v;
    			unset($data[$key]);

                //再次调用方法
    			$this->rbac($data,$v->id,$level+1);
    		}
    	}
    	return $arr;
    }