February 12, 2011 
Definition:
function register_theme_directory( $directory) {}
Register a directory that contains themes.
Parameters
- string $directory: Either the full filesystem path to a theme folder or a folder within WP_CONTENT_DIR
Source code
function register_theme_directory( $directory) {
global $wp_theme_directories;
/* If this folder does not exist, return and do not register */
if ( !file_exists( $directory ) )
/* Try prepending as the theme directory could be relative to the content directory */
$registered_directory = WP_CONTENT_DIR . '/' . $directory;
else
$registered_directory = $directory;
/* If this folder does not exist, return and do not register */
if ( !file_exists( $registered_directory ) )
return false;
$wp_theme_directories[] = $registered_directory;
return true;
}
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A HitchHackers guide through WordPress 
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