phpvms/app/Events/UserStatsChanged.php

<?php

namespace App\Events;

use App\Contracts\Event;
use App\Models\User;

class UserStatsChanged extends Event
{
    public $stat_name;
    public $old_value;
    public $user;

    /*
     * When a user's stats change. Stats changed match the field name:
     *   airport
     *   flights
     *   rank
     */
    public function __construct(User $user, $stat_name, $old_value)
    {
        $this->user = $user;
        $this->stat_name = $stat_name;
        $this->old_value = $old_value;
    }
}