Question

在对数据进行分组之后是否可以删除密钥？现在，我正在使用csv文件导入功能。我有两行数据，同一学生但书不同，因为我想根据学生ID对书进行分组。

代码

foreach ($book as $item) {
    $item['books'] = [
            'number' => $item['number'],
            'description' => $item['description'],
            ];

    if (!isset($group_by[$item['student_id']])) {
                            $group_by[$item['student_id']] = array(
                                'student_id' => $item['student_id'],
                                'name' => $item['name'],

                            );
                        }

    $group_by[$item['student_id']]['books'][] = $item['books'];

}

这是我的分组功能，可以按预期工作，但数据结构与我的系统不匹配

结果在这里

array:1 [
  "ST001" => array:9 [
    "student_id" => "ST001"
    "name" => "joe"
    "books" => array:2 [
      0 => array:2 [
        "number" => "1"
        "description" => "The magic"
      ]
      1 => array:2 [
        "number" => "2"
        "description" => "Forest in norway"
      ]
    ]
  ]
]

期望结果

array:9 [
    "student_id" => "ST001"
    "name" => "joe"
    "books" => array:2 [
      0 => array:2 [
        "number" => "1"
        "description" => "The magic"
      ]
      1 => array:2 [
        "number" => "2"
        "description" => "Forest in norway"
      ]
    ]
  ]

我不知道如何删除St001数组。我确实尝试过此$group_by[] = array(，但books数据将脱离数据结构。

Answer 1

将内部数组分配给另一个数组。

$array = $array['ST001'];

Answer 2

这将对您有帮助

foreach($book as $item)
{
$item['books'] = ['number' => $item['number'], 'description' => $item['description'], ];
if (!isset($group_by[$item['student_id']]))
    {
    $group_by[$item['student_id']] = array(
        'student_id' => $item['student_id'],
        'name' => $item['name'],
    );
    }

$group_by[$item['student_id']]['books'][] = $item['books'];
}

// remove key and get only value as you want

print_r(array_values($group_by));

删除了数组分组键

2 个答案: