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Most discussion is in the PHP coding help, and at times the Client Side sub forums.

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.

You can't. Not from PHP. But Safari on any Mac that's been updated in the last couple years will support it. There are client-side options, if you really need to know. Or you could just, you know, not serve WEBPs to Safari.