PHP register_shutdown_function 1秒延迟

我试图弄清楚为什么PHP需要1秒才能执行register_shutdown_function.如果有办法克服这一点.

";
}

register_shutdown_function('shutdown', $start_time);
register_shutdown_function('shutdown', $start_time);
register_shutdown_function('shutdown', $start_time);
register_shutdown_function('shutdown', $start_time);
register_shutdown_function('shutdown', $start_time);

输出:

1001ms
2001ms
3003ms
4003ms
5003ms

在Windows/PHP上运行XAMPP 1.6.8:5.2.6