lambda - PHP sandbox/sanitize code passed to create_function

Question

I am using create_function to run some user-code at server end. I am looking for any of these two:

1. Is there a way to sanitize the code passed to it to prevent something harmful from executing?
2. Alternately, is there a way to specify this code to be run in a sandboxed environment so that the user can't play around with anything else.

Thanks!

Answer 1

http://php.net/runkit