Why do you use the Multibyte String Functions(mb_*)?

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Iconv Functions(iconv_*) is a basic run version PHP5.

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class CI_Form_validation

Code:

function min_length($str, $val)
    {
        if (preg_match("/[^0-9]/", $val))
        {
            return FALSE;
        }

        if (function_exists('mb_strlen'))
        {
            return (mb_strlen($str) < $val) ? FALSE : TRUE;
        }

        return (strlen($str) < $val) ? FALSE : TRUE;
    }