How to count and group a query by two columns? - php

Question

I have an collection returned by a Eloquent Query. Each element of the collection is an array with only two integers elements (branch_id, event_id). I need to make and array or collection where all the identical pairs of elements are combined in the same array, because I need to count how many times a pair of elements appears and also being able to access to its values.
I am using the groupBy method of Query Builder to group the result by two columns, but it only returns the data combined by the first column name I passed to the method.
For Example:
array:15 [▼
0 => {#277 ▼
+"branch_id": 1
+"event_id": 1
}
1 => {#279 ▼
+"branch_id": 1
+"event_id": 1
}
2 => {#280 ▼
+"branch_id": 1
+"event_id": 1
}
3 => {#281 ▼
+"branch_id": 1
+"event_id": 1
}
4 => {#282 ▼
+"branch_id": 1
+"event_id": 2
}
5 => {#283 ▼
+"branch_id": 1
+"event_id": 21
}
6 => {#292 ▼
+"branch_id": 58
+"event_id": 21
}
7 => {#284 ▼
+"branch_id": 2
+"event_id": 5
}
8 => {#285 ▼
+"branch_id": 3
+"event_id": 3
}
9 => {#286 ▼
+"branch_id": 4
+"event_id": 4
}
10 => {#287 ▼
+"branch_id": 5
+"event_id": 9
}
11 => {#289 ▼
+"branch_id": 5
+"event_id": 9
}
12 => {#288 ▼
+"branch_id": 5
+"event_id": 8
}
13 => {#290 ▼
+"branch_id": 7
+"event_id": 10
As you can see, the first four arrays has the same values (branch_id: 1, event_id: id) I need to retrieve those values combined in a single array, and so forth with every array that has the same values.

Answer 1

I was able to do it this way...
public function getAllIncidents()
{
$i = 0;
$data = [];
$values = DB::table('incidents')->select('branch_id', 'event_id')->orderBy('branch_id')->get()->groupBy('event_id');
foreach ($values as $key => $value) {
$collections[$i] = $value->groupBy('branch_id');
$i++;
}
$collections = array_collapse($collections);
$i = 0;
foreach ($collections as $key => $collection) {
$array = $collection->toArray();
$data[$i]['count'] = sizeof($array);
$data[$i]['branch_id'] = $array[0]->branch_id;
$data[$i]['event_id'] = $array[0]->event_id;
$i++;
}
return response()->json($data, 200);
}