如何组合数据数组并使其更易于使用

Question

我正在使用一个可以在搜索后使用的过滤器，这样我就在数据库中创建了一个表并插入了一些类别及其子类别，现在我想将所有这些组合成一个树状结构。但我坚持这个

现在我怎样才能做到这一点？

[
  {
    "parent_category": "Recruitment",
    "category_name": "Job description"
  },
  {
    "parent_category": "Recruitment",
    "category_name": "Forms"
  },
   {
    "parent_category": "Performance management system",
    "category_name": "Job description"
  },
  {
    "parent_category": "Exit",
    "category_name": "Job description"
  }
  ]

对于这种类型的结果：

[
  {
    "parent_category": "Recruitment",
    "category_name": "Job description, Forms"
  },
   {
    "parent_category": "Performance management system",
    "category_name": "Job description"
  },
  {
    "parent_category": "Exit",
    "category_name": "Job description"
  }
  ]

不使用长类型的 for 循环，因为它消耗更多时间。

Answer 1

试试这个

$data = [
    [
        "parent_category" => "Recruitment",
        "category_name" => "Job description",
    ],
    [
        "parent_category" => "Recruitment",
        "category_name" => "Forms",
    ],
    [
        "parent_category" => "Performance management system",
        "category_name" => "Job description",
    ],
    [
        "parent_category" => "Exit",
        "category_name" => "Job description",
    ],
];
$result = collect($data)->groupBy('parent_category')->map(function ($categories, $parentCategory) {
    return [
        'parent_category' => $parentCategory,
        'category_name' => collect($categories)->pluck('category_name')->unique()->join(', '),
    ];
})->values();

Answer 2

你可以这样做：

$result = [];

foreach ($categories as $category) {
    if (!isset($result[$category->parent_category])) {
        $result[$category->parent_category] = $category;
    } else {
        $result[$category->parent_category]->category_name .= ', ' . $category->category_name;
    }
}

echo json_encode(array_values($result));