php数组分组问题

php二维数组按某个字段分组：php <?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 ,'p

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