PHP两种实现无级递归分类的方法

话不多说，请看代码：

function recursiveAssort($assortPid, $tag = '')
{ 
 $assort = M('goods_class')->where("class_pid = $assortPid")->field('class_id, class_name')->select();
 foreach ($assort as $value) {
 $tree .= '' . $tag . $value['class_name'] . '';
 $tree .= recursiveAssort($value['class_id'], $tag . ' ');
 }
 return $tree;
}

 public function get_access()
 {
 $access = array();
 $field = 'id, pid, method, name, description';
 $q_access = $this->db->select($field)->get('access');
 $q_result = $q_access->result_array();
 if (!empty($q_result)) {
  $items = array();
  foreach ($q_result as $value) {
  $items[$value['id']] = $value;
  }
  foreach ($items as $key => $item) {
  if ($item['pid'] == 0) {
   $access[] = &$items[$key];
  } else {
   $items[$item['pid']]['sub_access'][] = &$items[$key];
  }
  }
 }
 return $access;
 }

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