If you want to inspect what php variables you have available to call in a drupal site just paste
<?php print phpinfo(); ?>
You will need to set the filter format to php.
When you view the page you will have a dump of the php variables.
The Drupal project is superb. It has a fantastic stable core CMS and an overwhelming number of contributed modules, themes and community powered documntation system. It is all too easy for commercial organisations to visit, download and go away having never really put anything back into the community.The pressures of daily deadlines, the boss who doesn't quite get the whole open sourse ethos, whatever the reason some companies just don't put back.So how can you contribute to the cause. Well why not follow some of these suggestions