theme

Drupal's administration theme functionality works very simply: if the first argument of the internal path is admin, the custom theme is set to the admin theme.

This suggests that the $custom_theme variable can be set by modules to change to any arbitrary theme, and it will override the default theme.

The setting of custom_theme to admin_theme is done in system module's implementation of hook_menu:

Motivation for this function: sure, we could use a plain node_load($nid) and wrap every $node->field['0']['value'] in a check_plain or the function for rendering with the proper input format (check_plain). The proper format is available to be grabbed from the data provided by a regular node_load. But that's a lot of work and not the way we're used to theming things in .tpl.php

Looking for the drupal path to your current theme? It can be helpful if you're making a theme and, for a change, you want to link directly to

print theme('stylesheet_import', base_path() . path_to_theme() ."/modules.css");

For our purposes, something like:

<img src="<?php echo base_path() . path_to_theme() . "/sample.png"; ?>" />

Now I'm not sure that "." in echo will work. Feel free to test it out for us!