unyx / utils

        $result = [];

        $length = mb_strlen($haystack, $encoding ?: static::encoding($haystack));

        for ($idx = 0; $idx < $length; $idx++) {

            $result[] = mb_substr($haystack, $idx, 1, $encoding);

        }

        return $result;

    }

        }

        // Reverse one character after the other, counting from the end.

        for ($i = $length - 1; $i >= 0; $i--) {

            $result .= mb_substr($str, $i, 1, $encoding);

        }

        return $result;

    }