$mystuff = collect($something);
$num = $mystuff->groupBy('dateDay')->map(function ($row) {
return $row->sum('n');
});
dd($num);
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August 12, 2021 22:15
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Laravel | Collection group with sum values
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https://laracasts.com/discuss/channels/eloquent/summing-a-value-and-grouping-by-date-on-a-eloquent-collection