php数组分组问题 php二维数组按某个字段分组：<?php$order_item = Array ( => Array ( 'order_id' => 1111 ,'item_id' => 1, 'pro_id' => 1, 'pro_name' => 1111 ,'buy_num' => 5), => Array ( 'order_id' => 1111 ,'item_id' => 2 , php小知识 2023-04-03 171 点赞 2 评论 259 浏览
