在Laravel多维集合中提取特定值

Illuminate\Database\Eloquent\Collection {#948 ▼
  #items: array:3 [▼
    "26-01-2021" => Illuminate\Database\Eloquent\Collection {#972 ▶}
    "01-02-2021" => Illuminate\Database\Eloquent\Collection {#962 ▶}
    "03-11-2021" => Illuminate\Database\Eloquent\Collection {#965 ▼
      #items: array:1 [▼
        0 => App\Models\DaysEvent {#994 ▼
          #table: "days_events"
          // ... 其他Eloquent模型属性
          #attributes: array:29 [▼
            "id" => 166
            "title" => "Individual Interview"
            "slug" => "individual-interview"
            "location" => "Online"
            // ... 其他属性
          ]
          // ...
        }
      ]
    }
  ]
}

use App\Models\DaysEvent; // 确保引入了DaysEvent模型

// 假设 $events 变量已按上述结构填充
// 获取特定日期的集合
$dayCollection = $events['03-11-2021'];

// 获取该日期集合中的第一个DaysEvent模型
$firstEvent = $dayCollection[0]; // 或者 $dayCollection->first()

// 访问模型的属性
$eventTitle = $firstEvent->title;
$eventLocation = $firstEvent->location;

echo "特定事件标题: " . $eventTitle . "\n"; // 输出: 特定事件标题: Individual Interview
echo "特定事件地点: " . $eventLocation . "\n"; // 输出: 特定事件地点: Online

use Illuminate\Support\Collection;
use App\Models\DaysEvent;

/**
 * 假设 $events 是如上所示的 Illuminate\Database\Eloquent\Collection
 * 结构为：Collection<string, Collection<int, DaysEvent>>
 */
$allEventDetails = $events->flatMap(function (Collection $dayEvents) {
    // $dayEvents 是一个 Illuminate\Database\Eloquent\Collection，其中包含 DaysEvent 模型
    return $dayEvents->map(function (DaysEvent $event) {
        // $event 是一个 App\Models\DaysEvent 实例
        return [
            'title' => $event->title,
            'location' => $event->location,
            // 如果需要，可以添加其他字段，例如日期
            // 'date' => $event->event_start->format('Y-m-d'), // 假设 event_start 是 Carbon 实例
        ];
    });
});

// $allEventDetails 现在是一个包含所有事件标题和地点的扁平化集合
// 结构示例：
// [
//   ['title' => 'Event A', 'location' => 'Venue 1'],
//   ['title' => 'Event B', 'location' => 'Venue 2'],
//   // ...
//   ['title' => 'Individual Interview', 'location' => 'Online'],
// ]

// 遍历结果
foreach ($allEventDetails as $event) {
    echo "标题: " . $event['title'] . ", 地点: " . $event['location'] . "\n";
}

use Illuminate\Support\Collection;
use App\Models\DaysEvent;

/**
 * 假设 $events 是如上所示的 Illuminate\Database\Eloquent\Collection
 */
$nestedMappedEvents = $events->map(function (Collection $dayEvents) {
    // 为每个日期集合，提取其内部事件的 title 和 location
    return $dayEvents->map(function (DaysEvent $event) {
        return [
            'title' => $event->title,
            'location' => $event->location,
        ];
    });
});

// $nestedMappedEvents 此时是一个包含嵌套集合的集合
// 结构示例：
// [
//   "26-01-2021" => Collection [ ['title' => 'Event A', 'location' => 'Venue 1'], ... ],
//   "01-02-2021" => Collection [ ['title' => 'Event C', 'location' => 'Venue 3'] ],
//   // ...
// ]

// 使用 collapse 方法将所有内部集合合并成一个扁平的集合
$allEventDetailsCollapsed = $nestedMappedEvents->collapse();

// $allEventDetailsCollapsed 的结果与 flatMap 相同
foreach ($allEventDetailsCollapsed as $event) {
    echo "标题: " . $event['title'] . ", 地点: " . $event['location'] . "\n";
}

use Illuminate\Support\Collection;
use App\Models\DaysEvent;

/**
 * 假设 $events 是如上所示的 Illuminate\Database\Eloquent\Collection
 */
$allEventTitles = $events->flatMap(function (Collection $dayEvents) {
    // 直接在内部集合上使用 pluck 提取所有 title
    return $dayEvents->pluck('title');
});

// $allEventTitles 现在是一个包含所有事件标题的扁平化集合
// 结构示例：
// ['Event A', 'Event B', 'Event C', 'Individual Interview']

foreach ($allEventTitles as $title) {
    echo "事件标题: " . $title . "\n";
}