Warning: mysqli::__construct(): php_network_getaddresses: getaddrinfo for mysql failed: Name or service not known in /var/www/html/config.php on line 11

Fatal error: Uncaught mysqli_sql_exception: php_network_getaddresses: getaddrinfo for mysql failed: Name or service not known in /var/www/html/config.php:11 Stack trace: #0 /var/www/html/config.php(11): mysqli->__construct('mysql://root:12...', 'root', Object(SensitiveParameterValue), 'sahan') #1 /var/www/html/index.php(8): include_once('/var/www/html/c...') #2 {main} thrown in /var/www/html/config.php on line 11