Please don’t rely on DOCUMENT_ROOT

The latest version of MMR (1.8.12 at the time of writing) relies on $_SERVER[‘DOCUMENT_ROOT’] to figure out the relative path to wp_content. This is not a good idea because $_SERVER[‘DOCUMENT_ROOT’] may not actually be part of WP_CONTENT_DIR (it is generally not a good idea to rely on anything in $_SERVER).

Real world example (shared hosting on 1&1 Ionos, note that WP_CONTENT_DIR is not overridden anywhere):

ABSPATH = /homepages/2/<user>/htdocs/wordpress/
WP_CONTENT_DIR = /homepages/2/<user>/htdocs/wordpress/wp-content

$_SERVER[‘DOCUMENT_ROOT’] = /kunden/homepages/2/<user>/htdocs/wordpress