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Moving from PHP 5.4.45 to PHP 8 is a significant version upgrade, and it's good that you are considering updating your code accordingly. Here are some points to consider: 1. mysql_query(): The mysql_ functions, including mysql_query(), have been deprecated and removed in later PHP versions. You should replace them with MySQLi or PDO. 2. PDO: While you've updated your code to use PDO, keep in mind that PDO is a database access layer providing a uniform method of access to multiple databases, including MySQL. It should work fine with MySQL 5.7.4-43. It's important to note that updating to PHP 8 and MySQL 5.7 may introduce other compatibility issues or deprecated features in your code. It's recommended to thoroughly test your application in a development environment before making these changes on your live server.