Should be $server = "sql200.epizy.com";
SQL servers generally run on port 3306 not port 443 (HTTPS). And I don’t know if that greater-than symbol was a mis-type or you have that in your code, but it should be gone as well.
I’m sorry, but that’s not allowed on our hosting, and not going to work either because of this security system:
Please remember: we provide a website hosting service, not a data collection/analytics platform.
Please enter the details displayed in the client area and control panel. There are never any slashes, brackets or colons in any of the values you need to use.
Also, the mysql_* functions were removed from PHP ~8 years ago. Programming languages evolve over time, so only ever follow recent tutorials, not ones from 10+ years ago. Please use MySQLi or PDO instead.