$db not defined, connection.php is valid afaik

[i-am-called-glitchy]

Stack trace:
#0 {main}
  thrown in /home/glitchy/staging/GMDprivateServer/accounts/registerGJAccount.php on line 21" while reading response header from upstream, client: 188.65.190.64, server: gdps.amcalledglitchy.dev, request: "POST /accounts/registerGJAccount.php HTTP/1.1", upstream: "fastcgi://unix:/var/run/php/php8.2-fpm.sock:", host: "gdps.amcalledglitchy.de

<?php
$servername = "127.0.0.1";
$port = 3306;
$username = "root";
$password = "redacted";
$dbname = "geometrydash";
?>```