Check validity of UTF-8 string

[MarkR]

Hi all, I'd like to be able to check whether a UTF-8 string is valid.

I'm currently using

 $value = mb_convert_encoding($original_value, "UTF-8");
 if (mb_strlen($value) != mb_strlen($original_value)) {
 // something wrong
}

Of course, it's possible that this may not work.

mb_convert_encoding produces no error or warning if it encounters an invalid UTF-8 sequence, nor does it replace it with the character specified by mb_substitute_character.

Mark