Can't collect data into one array using collapse

In Laravel 10 / PHP 8.2 app I try to collect data into one array using collapse in set requests where some params are changed:

$data = []

FOR(...
        $data = Arr::collapse($data, $query->where('some_field', $someParameter)->get()->toArray())



ENDFOR,

but that does not work and resulting array is empty. Do I need to use some other method, then collapse?

Arr::collapse() accepts only one argument and it must be an array of arrays.

In your loop, you're passing multiple arguments:

$data = Arr::collapse($data, $query->where(...)->get()->toArray());

Only the first argument is used and the second is ignored.

Internally it works like this:

public static function collapse($array)
{
    $results = [];

    foreach ($array as $values) {
        if ($values instanceof Collection) {
            $values = $values->all();
        } elseif (! is_array($values)) {
            continue;
        }

        $results[] = $values;
    }

    return array_merge([], ...$results);
}

I don't know exactly how your loop works but you can try to do the following:

$data = [];

for (...) {
    $data[] = $query->where('some_field', $someParameter)->get()->toArray();
}

$data = Arr::collapse($data);