Applies a very permissive XSS/HTML filter for admin-only use.
Use only for fields where it is impractical to use the whole filter system, but where some (mainly inline) mark-up is desired (so check_plain() is not acceptable).
Allows all tags that can be used inside an HTML body, save for scripts and styles.
string $string: The string to apply the filter to.
string The filtered string.
public static function filterAdmin($string) {
return static::filter($string, static::$adminTags);
}