代码示例：

foreach($sourceArray as $k=>$v) {
   $result[$v["sendto"]][] = $v; // sendto 根据你想要的
}

上面的只是适用于简单分组，如果遇到 统一数组中有重复分组的数据，就会遇到分组重复的问题，那么就需要使用下面的示例了。

代码示例：

$content = json_decode($cart->content, true);
$result  = [];

foreach ($content as $key => $val) {
   $list = [
         'goods_id'     => $val['goods_id'],
         'goods_title'  => $val['goods_title'],
         'goods_num'    => $val['goods_num'],
         'thumb'        => $val['thumb'],
         'market_price' => $val['market_price'],
         'single_price' => $val['single_price'],
         'updated_at'   => isset($val['updated_at']) ? $val['updated_at'] : Carbon::now()->toDateTimeString(),
   ];
   if(array_key_exists($val['company_id'],$result)){
      array_push($result[$val['company_id']]['list'],$list);
   }
   else{
      $result[$val['company_id']]['company_id']   = $val['company_id'];
      $result[$val['company_id']]['company_name'] = $val['company_name'];
      $result[$val['company_id']]['list'] = [];
      array_push($result[$val['company_id']]['list'],$list);
   }
}

返回值示例：

  "code": "1010000",
  "message": "获取购物车列表成功",
  "data": [
    {
      "company_id": "297186",
      "company_name": "jinantuyi",
      "list": [
        {
          "goods_id": "1",
          "goods_title": "测试产品",
          "goods_num": "1",
          "thumb": "https://ss0.bdstatic.com/94oJfD_bAAcT8t7mm9GUKT-xh_/timg?image&quality=100&size=b4000_4000&sec=1459834649&di=43457f9142b66d631b54cc778402853d&src=http://img63.afzhan.com/2/20141209/635537374782978835445.jpg",
          "market_price": "100.00",
          "single_price": "80.00",
          "updated_at": "2016-04-06 11:15:42"
        },
        {
          "goods_id": "3",
          "goods_title": "测试产品3",
          "goods_num": "2",
          "thumb": "https://ss0.bdstatic.com/94oJfD_bAAcT8t7mm9GUKT-xh_/timg?image&quality=100&size=b4000_4000&sec=1459834649&di=43457f9142b66d631b54cc778402853d&src=http://img63.afzhan.com/2/20141209/635537374782978835445.jpg",
          "market_price": "200.00",
          "single_price": "130.00",
          "updated_at": "2016-04-06 11:05:23"
        }
      ]
    },
    {
      "company_id": "284030",
      "company_name": "qiye002",
      "list": [
        {
          "goods_id": "2",
          "goods_title": "测试产品2",
          "goods_num": "1",
          "thumb": "https://ss0.bdstatic.com/94oJfD_bAAcT8t7mm9GUKT-xh_/timg?image&quality=100&size=b4000_4000&sec=1459834649&di=43457f9142b66d631b54cc778402853d&src=http://img63.afzhan.com/2/20141209/635537374782978835445.jpg",
          "market_price": "120.00",
          "single_price": "100.00",
          "updated_at": "2016-04-06 10:56:12"
        }
      ]
    }
  ]
}

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