Can I get a dump of the $processes and $maintenance?

I did a quick script of what I believe you're trying to achieve and it works for me. I get an output of 55155 which shows that the 3 is missing from the $processes array.

$processes = [1, 2, 4, 5];
$maintenance = [1, 2, 3, 4, 5];

$array_value = function ($value, $array) {
	$str = "$value";
	if (in_array($str, $array)) {
		echo 5;
	} else {
		echo 1;
	}
};

foreach ($maintenance as $m) {
	$array_value ($m, $processes);
}

Does this work : ####Logic

$processes  = DB::table('services')->get();
$process_id_all = array_pluck($processes, 'id');

$maintenances  = DB::table('maintenances')
				->select('id')
				->whereCarId($id)
				->groupBy('category_id')->get();
$process_id_maintainance = array_pluck($maintenance, 'process_id');

####View

@foreach ($maintenances as $maintenance)
	
	Id : {{ $maintenance->id }} 
	Process :
	@if (in_array($process_id_maintainance, $process_id_all))
		{{ $maintenance->process }} 
	@else
		Record missing;
	@endif

@endforeach

could you use the array_diff or array_intersect methods?