[php-src] Issue #7746: mysqli_sql_exception->getSqlState()

Issue: https://github.com/php/php-src/issues/7746 Author: nunoperalta ### Description Hello, About mysqli_sql_exception: https://www.php.net/manual/en/class.mysqli-sql-exception.php What's the point of: protected string $sqlstate; if we cannot access it? I was also trying: ``` class mysqli_sql_exception_x extends \mysqli_sql_exception { public function getSqlState() : string { return $this->sqlstate; } } ``` But then I get: > Class mysqli_sql_exception_x may not inherit from final class (mysqli_sql_exception) Why doesn't \mysqli_sql_exception contain a getSqlState() method? I see some workarounds with using Reflection, etc, but that's obviously not ideal. At least we can still use mysqli_sqlstate, but still...