如何在laravel中填充数组中缺少的日期？

use Carbon\Carbon;

$start = Carbon::create(2022, 1, 1);
$end = Carbon::create(2022, 1, 31);

$dates = [];
for ($date = $start; $date->lte($end); $date->addDay()) {
    $dates[] = $date->format('Y-m-d');
}

$existingDates = ['2022-01-01', '2022-01-03', '2022-01-05'];

$existingDatesCollection = collect($existingDates);

$missingDates = $datesCollection->diff($existingDatesCollection)->values();

$filledArray = $existingDates;
foreach ($missingDates as $missingDate) {
    $filledArray[] = $missingDate;
}