Warning: mysqli_connect(): php_network_getaddresses: getaddrinfo failed: Name or service not known in /var/www/html/includes/functions/database.php on line 7

Warning: mysqli_connect(): (HY000/2002): php_network_getaddresses: getaddrinfo failed: Name or service not known in /var/www/html/includes/functions/database.php on line 7
Unable to connect to database server!