Preventing Search Engine Bots from triggering a specific php script

[XGCommander]

I just finished a php caching mechanism for my website and the last hurdle I need to overcome is bots like google triggering a cache on every page. How do I go about detecting if a specific user is a bot so that I can prevent the caching script from triggering for them?

[de.monkeyz]

You'll want to have a look at robots.txt - http://en.wikipedia.org/wiki/Robots_exclusion_standard

[XGCommander]

I don't see how robots.txt can prevent a certain php file from being included, or a specific part of a file from being executed.

[de.monkeyz]

If you are only wanting to target portions of php which are included within larger files you still want to be crawled. The only thing I can think of is getting the array from get_browser and checking the browser value against something like this: http://www.useragentstring.com/pages/useragentstring.php

 

But that's likely to be compromised. If you have php files which will execute something you don't want a crawler to activate, you're best off disabling the entire page with robots.txt