Get list of all controllers 5

$classes = array_filter(get_declared_classes(), function ($class) {
      $isController = substr($class, -10) == 'Controller';
      $isNotPlainController = $isController && substr($class, -11) != '\Controller';
      return $isNotPlainController;
  });

  //Optional: to clear controller name from its namespace
  $controllers=array_map(function ($controller){
      return last(explode('\\',$controller));
  },$classes);

  //Optional: to reset keys of array to start from 0,1,2,...etc
  $controllers = array_values($controllers);
  
  //For Admin Controllers
  $admin_controllers = array_filter($controllers, function ($controller) {
      return strpos($controller, 'App\Http\Controllers\Admin') !== false;
  });