详解PHP两种实现无级递归分类的方法

/** * 无级递归分类 TP框架 * @param int $assortPid 要查询分类的父级id * @param mixed $tag 上下级分类之间的分隔符 * @return string $tree 返回的分类树型结构结果 * */ function recursiveAssort($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; }

/** * 利用php的引用传递 CI框架 * */ 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; }