Предполагая, что коллекции похожи на эти;
public function index()
{
$first = collect([
[
'date' => '2020-05-10',
'sum_total' => 10,
'count_total' => 5,
],
[
'date' => '2020-05-11',
'sum_total' => 11,
'count_total' => 6,
],
[
'date' => '2020-05-13',
'sum_total' => 5,
'count_total' => 7,
]
]);
$second = collect([
[
'date' => '2020-05-10',
'sum_total' => 1,
'count_total' => 5,
],
[
'date' => '2020-05-12',
'sum_total' => 2,
'count_total' => 4,
],
[
'date' => '2020-05-13',
'sum_total' => 0,
'count_total' => 7,
]
]);
return $first->merge($second)
->groupBy('date')
->map(function ($sub) {
return [
'date' => $sub->first()['date'],
'sum_total' => $sub->sum('sum_total'),
'count_total' => $sub->sum('count_total'),
];
})
->sortBy('date')
->values();
}
Он печатает;
[
{
"date": "2020-05-10",
"sum_total": 11,
"count_total": 10
},
{
"date": "2020-05-11",
"sum_total": 11,
"count_total": 6
},
{
"date": "2020-05-12",
"sum_total": 2,
"count_total": 4
},
{
"date": "2020-05-13",
"sum_total": 5,
"count_total": 14
}
]