Stringy\Stringy::offsetGet PHP 메소드

    public function offsetGet($offset)
    {
        $offset = (int) $offset;
        $length = $this->length();
        if ($offset >= 0 && $length <= $offset || $length < abs($offset)) {
            throw new OutOfBoundsException('No character exists at the index');
        }
        return \mb_substr($this->str, $offset, 1, $this->encoding);
    }