Hi Valerio! Thank you for looking into this. Reviewing these links implies that this requires an extension? So it cannot be done simply, directly from LocalSettings.php? Could you provide please a minimal example how to set as $CUSTOM_VARIABLE = "custom-content";? Template are generally awesome but won't work here. The use case here is multiple domain support, an alternative domain name accessing the same wiki/database, which already works great for me. What I really want to set is something similar to {{SERVER}} = //www.example.com {{SERVERNAME}} = www.example.com But I only need {{CUSTOM_APEX_DOMAIN_NAME}} = example.com The use case in mediawiki markup would then be: [{{protocoll_handler}}://forums.{{apex_domain_name}} our forums] (I.e. "relative domain names which support sub domain changes") This is the multiple domain support snippet which already works for me: ### if (preg_match("/onion.onion/i", $_SERVER['SERVER_NAME'])) { $wgServer = 'http://www.onion.onion'; $wgCanonicalServer = 'https://www.example.com'; $wgAllowExternalImagesFrom = array( 'http://127.0.0.1/', 'http://www.onion.onion/' ); $wgRenderHashAppend = "www.onion.onion"; $wgCachePrefix = "www.onion.onion"; $wgFileCacheDirectory = "$IP/cache/www.onion.onion"; $wgLocalisationUpdateDirectory = "$IP/cache/www.onion.onion"; $wgCacheDirectory = "$IP/cache/www.onion.onion"; $MY_FQDN = "http://www.onion.onion"; } else { $wgServer = '//www.example.com'; $wgCanonicalServer = 'https://www.example.com'; $wgAllowExternalImagesFrom = array( 'http://127.0.0.1/', 'https://www.example.com/' ); $wgRenderHashAppend = "www.example.com"; $wgCachePrefix = "www.example.com"; $wgFileCacheDirectory = "$IP/cache/www.example.com"; $wgLocalisationUpdateDirectory = "$IP/cache/www.example.com"; $wgCacheDirectory = "$IP/cache/www.example.com"; $MY_FQDN = "https://www.example.com"; } ### If I had the snippet to add custom magic words to LocalSettings.php, then kinda what I would add there is this: if (preg_match("/onion.onion/i", $_SERVER['SERVER_NAME'])) { $CUSTOM_APEX_DOMAIN_NAME = 'onion.onion'; } else { $CUSTOM_APEX_DOMAIN_NAME = 'example.com'; } Basically, how would I make $CUSTOM_APEX_DOMAIN_NAME available from inside the mediawiki? I've left the lengthy description of my use case out from my original post for brevity. Kind regards, Patrick Valerio Bozzolan: