I need to create an array to allow for other meta information to load within other sections of my site.

Right now I have this, but it only works for one page:

PHP Code:
<?php if ($_GET['main_page'] != 'mypage') { ?>
I need to create an array so I can do this for multiple pages, and close it with a <?php } ?>

Can someone please hook me up with the code for the array?