Template:BOMWarning

Warning:

Don't edit LocalSettings.php with document editors like Notepad on Windows 10 Version 1809 or earlier, TextEdit, or other text editors that add byte order marks to files. These break the PHP runtime of your wiki. Instead, use a code editor, e.g. Vim or Notepad++. These handle file encodings properly. They can also be used to repair files previously broken by document editors.