$dates1[] = [
[
'date' => "01.08.2023",
'qty' => 100
],
[
'date' => "02.08.2023",
'qty' => 15,
],
];
$dates1[] = [
[
'date' => "01.08.2023",
'qty' => 0
],
[
'date' => "03.08.2023",
'qty' => 25,
],
];
$result = [
[
'date' => "01.08.2023",
'qty' => 100
],
[
'date' => "02.08.2023",
'qty' => 15,
],
[
'date' => "03.08.2023",
'qty' => 25,
],
];