+ case 'u':
+ $ret = filter_var($val, FILTER_VALIDATE_BOOLEAN, FILTER_NULL_ON_FAILURE);
+ if (NULL === $ret) {
+ fwrite(STDERR, "Invalid argument for the -u option.\n");
+ fwrite(STDERR, usage($argv));
+ exit(1);
+ }
+ $options['show_usernames'] = $val;
+ break;
+