php可应用于面包屑导航的迭代寻找家谱树实现方法

<?phpecho "<pre>";$area = array(array('id'=>1,'area'=>'北京','pid'=>0),array('id'=>2,'area'=>'广西','pid'=>0),array('id'=>3,'area'=>'广东','pid'=>0),array('id'=>4,'area'=>'福建','pid'=>0),array('id'=>11,'area'=>'朝阳区','pid'=>1),array('id'=>12,'area'=>'海淀区','pid'=>1),array('id'=>21,'area'=>'南宁市','pid'=>2),array('id'=>45,'area'=>'福州市','pid'=>4),array('id'=>113,'area'=>'亚运村','pid'=>11),array('id'=>115,'area'=>'奥运村','pid'=>11),array('id'=>234,'area'=>'武鸣县','pid'=>21)); function familytree($arr,$id){ $list = array(); while($id){ $flag = false; foreach($arr as $v){  if($v['id']==$id){  array_unshift($list,$v['area']);  $id = $v['pid'];  $flag = true;  } } if(!$flag){  break; } } return $list;}print_r(familytree($area,113));?>