6 uses of UNICODE_MULTIBYTE

drupal_strlen in drupal-6.x/includes/unicode.inc
Count the amount of characters in a UTF-8 string. This is less than or equal to the byte count.
drupal_strtolower in drupal-6.x/includes/unicode.inc
Lowercase a UTF-8 string.
drupal_strtoupper in drupal-6.x/includes/unicode.inc
Uppercase a UTF-8 string.
drupal_substr in drupal-6.x/includes/unicode.inc
Cut off a piece of a string based on character indices and counts. Follows the same behavior as PHP's own substr() function.
unicode_requirements in drupal-6.x/includes/unicode.inc
Return Unicode library status and errors.
_unicode_check in drupal-6.x/includes/unicode.inc
Perform checks about Unicode support in PHP, and set the right settings if needed.