ThinkPHP采用实现三级循环代码实例

本文以实例描述了ThinkPHP采用标签实现三级循环代码，具体操作步骤如下：

1. 三级循环需要三维数组，实现代码如下：

function MakeTree($pid,$level) { 
 $map['pid'] = $pid; 
$map['level'] = $level; 
$result = $this->where($map)->order('rank ASC')->findall(); 
if($result){ 
 foreach ($result as $key => $value){ 
 $title = $value['alias']; 
 $list[$title]['id'] = $value['id']; 
 $list[$title]['pid'] = $value['pid']; 
 $list[$title]['alias']= $value['alias']; 
 $list[$title]['title'] = $value['title']; 
 $list[$title]['level'] = $value['level']; 
 $list[$title]['state'] = $value['state']; 
 $list[$title]['rank'] = $value['rank']; 
 if($value['level']<=3){ 
  $list[$title]['child'] = $this->_MakeSonTree($value['id']);
 } 
 } 
} 
return $list; 
} 

function _MakeSonTree($pid) { 
$map['pid'] = $pid; 
$result = $this->where($map)->order('rank ASC')->findall(); 
if($result){ 
 foreach ($result as $key => $value){ 
 $title = $value['alias']; 
 $list[$title]['id']= $value['id']; 
 $list[$title]['pid']= $value['pid']; 
 $list[$title]['alias']= $value['alias']; 
 $list[$title]['title'] = $value['title']; 
 $list[$title]['level'] = $value['level']; 
 $list[$title]['state'] = $value['state']; 
 $list[$title]['rank'] = $value['rank']; 
  if($this->haschild($value['id'])){  //先判断是否有第三级子类,最后的数组形如$result['child']['grandchild']; 
  $list[$title]['grandchild']=$this->_MakeSonTree($value['id']); 
  } 
 } 
} 
return $list; 
 } 

function haschild($id){ 
$result=D('LearningChannel')->where("pid=".$id)->find(); 
if($result){ 
 return true; 
 } 
 else return false; 
}

2.绑定volist标签：

 $result=D('Learning') ->MakeTree(0,1); 
 //dump($result);
 $this->assign('list',$result);

3.模板部分：

 
  
  selected >{$vo.alias}  
  
  selected >--{$child.alias}  
   
  selected >---{$grand.alias}