foreach 裡面又要 foreach 一個 array？

Question

請問如果要在 [] 中需要 foreach 怎麼辦呢？

$data[] = [
        'name' => $key['add_hour'].':00',
        'data' => [[  
          'x' => (int) $key['add_date'],
          'y' => (int) $key['times']
        ]
        // 這裡面會有多個 x 跟 y]
      ];

像這樣

$data[] = [

    'name' => $key['add_hour'].':00',
    'data' => [[  
      'x' => (int) $key['add_date'],
      'y' => (int) $key['times']
    ],
    [  
      'x' => (int) $key['add_date'],
      'y' => (int) $key['times']
    ],
    [  
      'x' => (int) $key['add_date'],
      'y' => (int) $key['times']
    ]]
  ];

Answer 1

如果赋值的过程可以修改的话直接在data外层套个数组

$data[] = [
  'name' => '1',
  'data' => [
    ['x' => 1, 'y' => 2]
  ]
];

要是不行的话就另外循环一遍进行转换

foreach ($data as &$item) {
  $item['data'] = [$item['data']];
}

---

直接在循环体内嵌套就好

$data[] = [
  'name' => '1',
  'data' => [
    ['x' => 1, 'y' => 2],
    ['x' => 3, 'y' => 4]
  ]
];

foreach ($data as $item) {
  foreach ($item['data'] as $child) {
    var_dump($child); //array(2) { ["x"]=> int(1) ["y"]=> int(2) } array(2) { ["x"]=> int(3) ["y"]=> int(4) }
  }
}

如果需要操作数组的话记得加上&