Favortire Page template Structure

I was interested in seeing if anyone has a favorite way of structuring their PHP pages? For instance, I found one example where pages were laid out as follows: Everything was based off of index.php and parameters were submitted through the hidden fields or through an action variable on the url querystring. Index.php --------- Begin example index.php ---------- <?php /* * Common include files here * Database connection initialization includes here * Security includes here */ /* * define local functions here */ /* * Initialize globals variables * and constants here */ /* * Define a main function here */ Function main(){ /* * Initialize local variables * and constants here */ /* capture action variable on url querystring */ /* do something based on action */ } ?> /* HTML Code here */ -----8<-- End Example --->8-- Any thoughts on this? I'm still kinda new at PHP and wanted to learn the best way to structure my code from the git-go. :) Thanks in advance, Jim