Role.php

/*
/-------------------
/ app/Enums/Role.php
/-------------------
*/

namespace App\Enums;

enum Role: string
{
  case User = 'user';
  case Admin = 'admin';
}

/*
/-------------------
/ routes/web.php
/-------------------

use App\Enums\Role;

Route::get('/users/{role}', function(Role $role) {
  return $role->value;
}