Dcrypt\Str::substr PHP Method

    public static function substr($string, $start, $length = null)
    {
        if (\function_exists('mb_substr')) {
            // Fix a weird quirk in PHP versions prior to 5.4.8
            if ($length === null && \version_compare('5.4.8', PHP_VERSION)) {
                $length = self::strlen($string);
            }
            return \mb_substr($string, $start, $length, '8bit');
        }
        return \substr($string, $start, $length);
        // @codeCoverageIgnore
    }