本人念的一个thinkphp无级分类方法，使用字符串传到模板

public function _getMenu($id=0,$t=0){<br />		$category = M("category");<br />		$data = $category->where("pid=$id")->order("sort asc")->select();<br />		<br />		if($data){<br />			$t++;	<br />			$data2['leavel'] = $t;<br />			$category->where("pid=$id")->save($data2);			//层级<br />			foreach($data as $key=>$value){	<br />			$sort = $value['sort'];<br />			$id = $value['id'];	<br />			$this->str .= '<tr><td><input name = "ids['.$id.']" type = "text" value = "'.$sort.'"></td>';			<br />			$this->str .= "<td>". $value['id']."</td>";<br />			if($t>1){<br />				if()			<br />			$this->str .= "<td>|-----".$value['name']."</td>";<br />			<br />			}else{<br />			$this->str .= "<td>".$value['name']."</td>";<br />			}<br />				$this->str .= "<td>".$value['group']."</td>";<br />				$id = $value['id'];<br />			$this->str .= '<td><a href = http://localhost/tptest/index.php/Article/deletelanmu?id='.$id.'>删除</a></td></tr>';<br />			$this->_getMenu($value['id'],$t);<br />			}<br />				<br />			}<br />		}