thinkphp 无限级分类

 class CatModel extends Model{
          public  function  gettree($p=0,$lv=0){
                $t=array();
                foreach($this->select()as $k=>$v){
                	if($v['parent_id']==$p){
                		$v['lv']=$lv;
                		$t[]=$v;
                		$t=array_merge($t,$this->gettree($v['cat_id'],$lv+1));//合并数组
                	}
                }
               return $t;
          }
 }

html表单中的左边距也要相应变化

 style="margin-left:{$cat['lv']*2}em