/**
* Table name prefix.
- * This should be alphanumeric, contain neither spaces nor hyphens, and end in "_"
+ * Should be alphanumeric plus underscores, and not contain spaces nor hyphens.
+ * Suggested format ends with an underscore.
*/
$wgDBprefix = '';
/**
* Array mapping class names to filenames, for autoloading.
*/
-$wgAutoloadClasses = [];
+$wgAutoloadClasses = $wgAutoloadClasses ?? [];
/**
* Switch controlling legacy case-insensitive classloading.