unyx / utils

        $length   = mb_strlen($haystack, $encoding);

        // Make sure the offset is contained in the initial string.

        if (abs($offset) >= $length) {

            throw new \OutOfBoundsException('The given $offset ['.$offset.'] does not exist within the string ['.static::truncate($haystack, 20, '...', false, $encoding).'].');

        }

        // With a negative offset, we'll convert it to a positive one for the initial part (before the inserted

        // substring), since we'll be using that as a length actually.

        $length   = mb_strlen($haystack, $encoding);

        // Make sure the offset given exists within the $haystack.

        if (abs($offset) >= $length) {

            throw new \OutOfBoundsException('The given $offset ['.$offset.'] does not exist within the string ['.static::truncate($haystack, 20, '...', false, $encoding).'].');

        }

        $func   = $strict ? 'mb_strpos' : 'mb_stripos';

        $result = [];

        // Check if the absolute starting index (to account for negative indices) + 1 (since it's 0-indexed

        // while length is > 1 at this point) is within the length of the string.

        if (abs($offset) >= mb_strlen($haystack, $encoding)) {

            throw new \OutOfBoundsException('The given $offset ['.$offset.'] does not exist within the string ['.static::truncate($haystack, 20, '...', false, $encoding).'].');

        }

        return mb_substr($haystack, $offset, $length, $encoding);

    }

        // Check if the absolute starting index (to account for negative indexes) + 1 (since it's 0-indexed

        // while length is > 1 at this point) is within the length of the string.

        if (abs($offset) >= mb_strlen($haystack, $encoding)) {

            throw new \OutOfBoundsException('The given $offset ['.$offset.'] does not exist within the string ['.utils\Str::truncate($haystack, 20, '...', $encoding).'].');

        }

        return mb_substr($haystack, $offset, 1, $encoding);

    }