commandline php

Hello Everyone

I have a php script that runs for about 30 minutes.

I'm calling the script every minute from the command line using cron.

I want multiple instances of the same script running concurrently without one interfering with the other?

What I want to do is to be able to run a new instance each minute, and not have the new instance interfere with currently running processes.

For example, if one process generates a random password $password, would that value be affected if another process generates it's own $password?

Thanks in Advance

I don't think it will, just because as long as they're different processes they will have their own process memory space and their own variables.