26,'parent_cid'=>0,'name'=>"饭"),    array('cid'=>27,'parent_cid'=>26,'name'=>"米饭"),    array('cid'=>28,'parent_cid'=>27,'name'=>"蛋炒饭"),    array('cid'=>29,'parent_cid'=>28,'name'=>"粗茶淡饭")	);//两次循环组装array的树形态/**  @$date:*  @$root:*  @$cid:*  @$pid:*  @$child:*/function data2tree($data,$root=0,$cid='id',$pid='pid',$child="_child"){     $tree = array();     $_temp = array();     foreach($data as $key=>$val)     {     	 $_temp[$val[$cid]] = & $data[$key];     }     //$data[0]['name']="饭xx";     //var_dump($_temp);          foreach($data as $key=>$val)     {     	$parentId = $val[$pid]; //上级id     	if($root == $parentId)     	{     		$tree[] = &$data[$key];     	}else{     		if(isset($_temp[$parentId])) //判断在$_temp数组中是否存在该父元素     		{     			$parent = &$_temp[$parentId]; //将这个父级用引用放处到一个$parent变量中去     			$parent[$child][]=&$data[$key]; //设置当前元素为$parent元素的子元素     		}     	}     }     return $tree;}//递归输出数据function output($tree){	if(count($tree)>=1)	{		foreach($tree as $v)		{		    echo "
{$v['name']}";		    if(isset($v['_child']) && count($v['_child']) >=1)		    {		    	echo "
      
       ".output($v['_child'])."
      
";		    }		    echo "
";		}	}}$tree = data2tree ( $data, 0, 'cid', 'parent_cid' );output($tree);echo "
";$items = array(    1 => array('id' => 1, 'pid' => 0, 'name' => '江西省'),    2 => array('id' => 2, 'pid' => 0, 'name' => '黑龙江省'),    3 => array('id' => 3, 'pid' => 1, 'name' => '南昌市'),    4 => array('id' => 4, 'pid' => 2, 'name' => '哈尔滨市'),    5 => array('id' => 5, 'pid' => 2, 'name' => '鸡西市'),    6 => array('id' => 6, 'pid' => 4, 'name' => '香坊区'),    7 => array('id' => 7, 'pid' => 4, 'name' => '南岗区'),    8 => array('id' => 8, 'pid' => 6, 'name' => '和兴路'),    9 => array('id' => 9, 'pid' => 7, 'name' => '西大直街'),    10 => array('id' => 10, 'pid' => 8, 'name' => '东北林业大学'),    11 => array('id' => 11, 'pid' => 9, 'name' => '哈尔滨工业大学'),    12 => array('id' => 12, 'pid' => 8, 'name' => '哈尔滨师范大学'),    13 => array('id' => 13, 'pid' => 1, 'name' => '赣州市'),    14 => array('id' => 14, 'pid' => 13, 'name' => '赣县'),    15 => array('id' => 15, 'pid' => 13, 'name' => '于都县'),    16 => array('id' => 16, 'pid' => 14, 'name' => '茅店镇'),    17 => array('id' => 17, 'pid' => 14, 'name' => '大田乡'),    18 => array('id' => 18, 'pid' => 16, 'name' => '义源村'),    19 => array('id' => 19, 'pid' => 16, 'name' => '上坝村'),);function getTree9($items){	 $tree = array();	 foreach ($items as $item) 	 {	 	if(isset($items[$item['pid']])) //判断父ID是否存在	 	{	 		$items[$item['pid']]['son'][] = &$items[$item['id']];	 	}else{	 		$tree[] = &$items[$item['id']];	 	}	 }	 return $tree;}//$arr = getTree9($items);//var_dump($arr);function getTree5($items){	foreach($items as $item){		$items[$item['pid']]['son'][$item['id']] = &$items[$item['id']];		}	return isset($items[0]['son']) ? $items[0]['son'] : array();}$arr = getTree5($items);var_dump($arr);?>