Warning: mysqli::__construct(): php_network_getaddresses: getaddrinfo for db failed: Name or service not known in /home/bar/www/index.php on line 7

Fatal error: Uncaught mysqli_sql_exception: php_network_getaddresses: getaddrinfo for db failed: Name or service not known in /home/bar/www/index.php:7 Stack trace: #0 /home/bar/www/index.php(7): mysqli->__construct('db', 'user', Object(SensitiveParameterValue), 'mydatabase') #1 {main} thrown in /home/bar/www/index.php on line 7