Bug tracker
bugs in includes/utf/utf_tools.php (fix completed in vcs)
return mb_strrpos($str, $search);
and it should be:
return mb_strrpos($str, $needle, $offset);
in function utf8_strpos
if ($offset === false)
should be:
if (is_null($offset))
in function utf8_substr
if ($length === false)
should be:
if (is_null($length))
the are on line 141、177、211