phpinfo
On occassion it is useful to see what your php settings are. You can create a php page using phpinfo() function from within your own Drupal install if you can create php type content. This is probably not a page you want to leave permanently but can be useful for finding specific information.
Create a page of php content type and copy and paste the following line in it.
<?php
phpinfo();
?>It will probably mess up your sites formatting.
regarding this sort of thing
As I find myself doing this sort of thing a lot, I highly recommend the devel module during the development phase.
The devel block includes a phpinfo() menu item. Plus there is a heap of other useful things that you'll use from time to time.