What exactly are you looking to do? spawn_conditions is a very broad topic and I won't be able to help with such a general request.
I'm not sure which database you're using, because PEQ got rid of the Perl timers long ago in favor of spawn_events. (Maybe you're using Angelox, or a very old version of PEQ?) However, if you are planning on using proximity then you won't use spawn_events. spawn_events changes spawn_condition based on time of day (or month, or year, etc) and is used in the PEQ db for Kithicor and all the other zones with day/night cycles. It is entirely DB/server driven and does not use Perl at all, so no scripts are required. If you need another method to change spawn_conditions, then you'll have to use Perl combined with setting up the appropriate DB entries. If you tell me what you need, I can give you some examples.
In the meantime, grab the newest PEQ DB and quests from here
https://code.google.com/p/projecteqdb/downloads/list and here:
https://code.google.com/p/projecteqq...downloads/list and check out Kithicor, and other day/night zones for example of spawn_events usage (look at the spawn_events table). Also, check out the Perl scripts in potimeb, especially the phase 3 trigger. That will give you an example of how to manipulate spawn_conditions within Perl.