[9.x] Make Connection Class Macroable

[haider00125]

I having a use case where I have to check database connection in different service providers. I am doing it in following way:

try {
    DB::connection()->getPdo();
} catch (Exception) {
    return false;
    // Don't proceed further;
}

If connection class is macroable then above check can be simplified like below.

  DB::macro('connected', function (string $connection = null) {
            try {
                DB::connection($connection)->getPdo();
                return true;
            } catch (Exception) {
                return false;
            }
  });

Implementation:

if (DB::connected()) {
     // Do something.
}