php laravel请求处理管道（装饰者模式）

class WelcomeController
{
    public function index()
    {
        echo 'session start.', PHP_EOL;
        echo 'hello!', PHP_EOL;
        echo 'session close.', PHP_EOL;
    }
}

class WelcomeController
{
    public function index()
    {
        echo 'hello!', PHP_EOL;
    }
}
interface Middleware
{
    public function handle(Closure $next);
}
class Seesion implements Middleware
{
    public function handle(Closure $next)
    {
        echo 'session start.', PHP_EOL;
        $next();
        echo 'session close.', PHP_EOL;
    }
}
$pipeList = [
    "Seesion",
];
 
function _go($step, $className)
{
    return function () use ($step, $className) {
        $o = new $className();
        return $o->handle($step);
    };
}
 
$go = array_reduce($pipeList, '_go', function () {
    return call_user_func([new WelcomeController(), 'index']);
});
$go();