<?php
// 应用公共文件
/*无限级分类*/
function obj_tree($list, $pk = 'id', $pid = 'pid', $child = 'child', $root = 0)
{
    $tree=array();
    foreach ($list as $key => $val) {
        if ($val->$pid == $root) {
            unset($list->$key);
            if (!empty($list)) {
                $child = obj_tree($list, $pk, $pid, $child, $val[$pk]);
                if (!empty($child)) {
                    $val->child=$child;
                } else {
                    $val->child = array();
                }
            }
            $tree[]=$val;
        }
    }
    return $tree;
}

function make_tree($list, $pk = 'id', $pid = 'pid', $child = 'child', $root = 0)
{
    $tree=array();
    foreach ($list as $key => $val) {
        if ($val[$pid]==$root) {
            unset($list[$key]);
            if (!empty($list)) {
                $child = make_tree($list, $pk, $pid, $child, $val[$pk]);
                if (!empty($child)) {
                    $val['child']=$child;
                } else {
                    $val['child']= array();
                }
            }
            $tree[]=$val;
        }
    }
    return $tree;
}