Arranging My Functions

Hi, I've created a big site contains about 500 functions to handle all the site logic. I saved all these functions in one file. - Should I separate them into grouped files ? - Is there any reference on the web on how to arrange my PHP code? Regards, Hamid Hossain ----------------------- Check Amazon.com Latest PHP books: http://www.amazon.com/exec/obidos/redirect?tag=zawraqclassif-20&path=tg/browse/-/295223 Start Accepting CreditCard at your site in minutes: http://www.2checkout.com/cgi-bin/aff.2c?affid=106720 Download Alexa Tool Bar to stop Pop-ups for FREE: http://download.alexa.com/?amzn_id=zawraqclassif-20 Download Ready-Made Templates for your site: http://www.aplustemplates.com/cgi/affiliates/c1.cgi/zawraq_ad ----------------------- _________________________________________________________________ The new MSN 8: smart spam protection and 2 months FREE* http://join.msn.com/?page=features/junkmail