I'll look forward to more PHP news in the coming months.
An updated version of WordPress is available.
You cannot update because WordPress 5.2.4 requires PHP version 5.6.20 or higher. You are running version 5.3.29.
Error establishing a database connection
This either means that the username and password information in your wp-config.php file is incorrect or we can’t contact the database server at b.custsql.sonic.net. This could mean your host’s database server is down.
Are you sure you have the correct username and password?
Are you sure that you have typed the correct hostname?
Are you sure that the database server is running?
If you’re unsure what these terms mean you should probably contact your host.
PHP requires an update
The SQL server is a required piece of software for the database WordPress uses to store all your site’s content and settings.
For optimal performance and security reasons, we recommend running MySQL version 5.6 or higher. Contact your web hosting company to correct this.