Php interpreter stopped

Question

How can I kick start the interpreter when it stops working?

Answer 1

I think you want to restart the associated web server. If you're running WAMP, you'd use the menu like this:
https://www.tng.lythgoes.net/wiki/images/f/fc/WAMP_Server_2.2_restart_all_services.png
Restarting all services is what I do when I want to be sure the php.ini and apache's config files are reloaded.
Unless you're using a web server, PHP will completely shut down itself when your script finishes.