在Controller层写一个树形结构json

假设你有一个树形结构的数据，如下：

[
  {
    "id": 1,
    "name": "Parent 1",
    "children": [
      {
        "id": 2,
        "name": "Child 1 of Parent 1",
        "children": [
          {
            "id": 4,
            "name": "Grandchild 1 of Child 1 of Parent 1",
            "children": []
          },
          {
            "id": 5,
            "name": "Grandchild 2 of Child 1 of Parent 1",
            "children": []
          }
        ]
      },
      {
        "id": 3,
        "name": "Child 2 of Parent 1",
        "children": []
      }
    ]
  },
  {
    "id": 6,
    "name": "Parent 2",
    "children": [
      {
        "id": 7,
        "name": "Child 1 of Parent 2",
        "children": [
          {
            "id": 8,
            "name": "Grandchild 1 of Child 1 of Parent 2",
            "children": []
          }
        ]
      }
    ]
  }
]

在 Controller 层中，你可以使用 Laravel 的 Response 类来返回一个 JSON 格式的数据。你需要将树形结构的数据转换为 JSON 格式的字符串，然后使用 Response 类将其返回。

你可以使用 PHP 的内置函数 json_encode 将数据转换为 JSON 格式的字符串。然后，你可以使用 Response 类的 json 方法将 JSON 格式的字符串作为响应返回。如下所示：

public function tree()
{
    $data = [
        [
            "id" => 1,
            "name" => "Parent 1",
            "children" => [
                [
                    "id" => 2,
                    "name" => "Child 1 of Parent 1",
                    "children" => [
                        [
                            "id" => 4,
                            "name" => "Grandchild 1 of Child 1 of Parent 1",
                            "children" => []
                        ],
                        [
                            "id" => 5,
                            "name" => "Grandchild 2 of Child 1 of Parent 1",
                            "children" => []
                        ]
                    ]
                ],
                [
                    "id" => 3,
                    "name" => "Child 2 of Parent 1",
                    "children" => []
                ]
            ]
        ],
        [
            "id" => 6,
            "name" => "Parent 2",
            "children" => [
                [
                    "id" => 7,
                    "name" => "Child 1 of Parent 2",
                    "children" => [
                        [
                            "id" => 8,
                            "name" => "Grandchild 1 of Child 1 of Parent 2",
                            "children" => []
                        ]
                    ]
                ]
            ]
        ]
    ];

    return response()->json($data);
}

在上面的例子中，我们将树形结构的数据保存在 $data 变量中。然后，我们使用 Laravel 的 Response 类将数据转换为 JSON 格式的字符串，并将其作为响应返回。