I would go with Flutter for the front end because it is easy to use once you learn Dart, has components for both Cupertino and Material Design, performs well, and has great documentation. For the backend, I've never used PHP so I don't know how good Laravel works, but I would usually use Node.js because of its large ecosystem, or Aqueduct, because if you use Flutter than you can use Dart on both the front and back end.