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一段數組為例：

$list = array:4 [
  0 => array:7 [
    "id" => 56
    "mer_id" => 7
    "order_id" => "wx163265961408769974"
    "is_postage" => 0
    "store_name" => "奇柏麗"
    "postage" => "快遞配送"
    "truePrice" => 42.0
  ]
  1 => array:7 [
    "id" => 67
    "mer_id" => 7
    "order_id" => "wx163274484223537232"
    "is_postage" => 0
    "store_name" => "奇柏麗"
    "postage" => "快遞配送"
    "truePrice" => 208.0
  ]
  2 => array:7 [
    "id" => 66
    "mer_id" => 3
    "order_id" => "wx163273502881634474"
    "is_postage" => 0
    "store_name" => "美麗小鋪"
    "postage" => "快遞配送"
    "truePrice" => 119.0
  ]
  3 => array:7 [
    "id" => 68
    "mer_id" => 1
    "order_id" => "wx163279157705472302"
    "is_postage" => 1
    "product_attr_unique" => "d973a4f5"
    "store_name" => "七七小鋪"
    "postage" => "到店自提"
    "truePrice" => 120.0
  ]
]

在這個數組中以到店自提（postage）和 快遞配送（postage）來分類，然后在此基礎上再以商家為基礎分類，用到的鍵名（is_postage，postage，mer_id，store_name）。

php代碼實現

$new = [];
        
foreach($list as $k => $item){
  if($item['is_postage'] ==0 ){

    $new[$item['is_postage']]['postage_name'] = "快遞配送";

  }else{

    $new[$item['is_postage']]['postage_name'] = "到店自提";

  }

  $new[$item['is_postage']]['postage'][$item['mer_id']]['store_name'] = $item['store_name'];
  $new[$item['is_postage']]['postage'][$item['mer_id']]['store'][$k] = $item;
}
dump($new);
order
輸出結果：
array:2 [
  0 => array:2 [
    "postage_name" => "快遞配送"
    "aa" => array:2 [
      7 => array:2 [
        "store_name" => "奇柏麗"
        "store" => array:2 [
          0 => array:7 [
            "id" => 56
            "mer_id" => 7
            "order_id" => "wx163265961408769974"
            "is_postage" => 0
            "store_name" => "奇柏麗"
            "postage" => "快遞配送"
            "truePrice" => 42.0
          ]
          1 => array:7 [
            "id" => 67
            "mer_id" => 7
            "order_id" => "wx163274484223537232"
            "is_postage" => 0
            "store_name" => "奇柏麗"
            "postage" => "快遞配送"
            "truePrice" => 208.0
          ]
        ]
      ]
      3 => array:2 [
        "store_name" => "美麗小鋪"
        "store" => array:1 [
          2 => array:7 [
            "id" => 66
            "mer_id" => 3
            "order_id" => "wx163273502881634474"
            "is_postage" => 0
            "store_name" => "美麗小鋪"
            "postage" => "快遞配送"
            "truePrice" => 119.0
          ]
        ]
      ]
    ]
  ]
  1 => array:2 [
    "postage_name" => "到店自提"
    "aa" => array:1 [
      1 => array:2 [
        "store_name" => "七七小鋪"
        "store" => array:1 [
          3 => array:7 [
            "id" => 68
            "mer_id" => 1
            "order_id" => "wx163279157705472302"
            "is_postage" => 1
            "store_name" => "七七小鋪"
            "postage" => "到店自提"
            "truePrice" => 120.0
          ]
        ]
      ]
    ]
  ]
]