class GameSimulatorHelper extends Model
{
    public function run()
    {
        // Get all the games from the database.
        $games = Game::all();

        // Simulate each game.
        foreach ($games as $g) {
            $sim = new GameSimulator();
            $sim->run($g);
            unset($sim);
        }
    }
}

class GameSimulator extends Model
{
    public $homeGoals = 0;
    public $awayGoals = 0;
    // A bunch of other class variables here.

    public function run($game)
    {
        $this->simulate($game);
        // This function just resets all the class variables for the next game to be simulated.
        $this->resetSimulator();
        echo 'MEMORY USAGE: '.memory_get_usage(true) . "n";
    }

    public function simulate()
    {
        $maxPeriods = 3;
        for ($p=1; $p <= $maxPeriods; $p++) {
            for ($i=1; $i <= 1200; $i++) {
                // Do many things here like get and set data in database.
            }
        }
    }
    // Many other functions below.
}