连接单个数据单元格中存在的多个json对象

Question

我有一个专栏 placementitems ，每次用户下订单时都会存储json对象。所以，我能够成功显示第一个json对象（第一个订单）。它会抛出a as 为第二个和第四个对象提供foreach（）的无效参数。

java.sql.Date

` 在laravel视图刀片

Collection {#207 ▼
  #items: array:1 [▼
  0 => Order {#211 ▼
  #casts: array:1 [▶]
  #fillable: array:8 [▶]
  #connection: null
  #table: null
  #primaryKey: "id"
  #keyType: "int"
  #perPage: 15
  +incrementing: true
  +timestamps: true
  #attributes: array:10 [▶]
  #original: array:10 [▼
    "id" => 1
    "tableno" => "9"
    "noofitems" => 2
    "placeditems" => ""[{\"item\":\" Cafe Latte\",\"qty\":\"2\"}][{\"item\":\" Egg Sandwich\",\"qty\":\"3\"}]""
    "total" => 106
    "paidstatus" => 0
    "deliveredstatus" => 0
    "created_at" => "2017-07-14 11:32:29"
    "updated_at" => "2017-07-14 11:36:37"
    "username" => "harish"
  ]
  #relations: []
  #hidden: []
  #visible: []
  #appends: []
  #guarded: array:1 [▶]
  #dates: []
  #dateFormat: null
  #touches: []
  #observables: []
  #with: []
  #morphClass: null
  +exists: true
  +wasRecentlyCreated: false
    }
  ]
}