laravel 按年、月分组统计

use Carbon\Carbon;

$notes = Note::select('id', 'created_at')->orderBy('created_at', 'desc')->get();
$noteCounts = [];
foreach ($notes as $post) {
    $date = Carbon::parse($post->created_at)->format('Y-m');
    // 按年和月分组统计文章数
    $year = Carbon::parse($post->created_at)->format('Y');
    $month = Carbon::parse($post->created_at)->format('m');
    if (!isset($noteCounts[$year])) {
        $noteCounts[$year] = []; // 初始化年份数组
    }
    if (!isset($noteCounts[$year][$month])) {
        $noteCounts[$year][$month] = 0; // 初始化月份数组并设置为0
    }
    $noteCounts[$year][$month]++; // 月份文章数加一
}