How would I use cron jobs from a PHP script? Is it reliable to use when managing important things?
You don't "use them from PHP'. You program the system to run some PHP scripts (e.g.: system commands) at a specified time. That's all. You can schedule a single run, a one day/week delayed task, or an hourly task. It's up to you.
Respawn: sorry, I have no clue.
I have optimistic thoughts, even though sometimes (if not always) life's a bitch.
this is not hard to fix,
make a batch file and you can like make a php script to excute the batch file,
or even if you want it at a time in cmd u can do as some one said here. put a time on when to start that php script,