• the wp-config.php file, and
• the uploads folder in miscellaneous settings

Some constants  plugins should use to deal with a variety of wordpress setups are:

• WP_CONTENT_DIR  – eg: www/www/something/publichtml/wp-content
• WP_CONTENT_URL – eg:  http:domainname/wp-content
• WP_LANG_DIR
• WP_PLUGIN_DIR
• WP_PLUGIN_URL
• STYLESHEETPATH (in case a theme uses another as it’s template, this and the next can be different)
• TEMPLATEPATH

For the full list of the latest version,
see http://xref.yoast.com/trunk/nav.html?index.html

There are some ‘constants’ that can be defined in wp-config, but are not then defined if not set in wp-config. these are

• WP_SITEURL  (where the wordpress code is – eg:  http:domainname/wp)
• WP_HOME (what your website calls home – eg:  http:domainname )

It would have been much simpler if wordpress would do as it does with the other others. check for defintion and if not set, then set them based on the DB options. Perhaps plugin authors can do this instead of multiple calls to bloginfo(‘siteurl’) or get_option(‘home’).

Example:

The 2.7 code has:

	if ( defined( 'WP_SITEURL' ) && '' != WP_SITEURL )

		$admin_dir = WP_SITEURL . '/wp-admin/';

	elseif ( function_exists( 'get_bloginfo' ) && '' != get_bloginfo( 'wpurl' ) )

		$admin_dir = get_bloginfo( 'wpurl' ) . '/wp-admin/';

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