Warning: mysqli::__construct(): php_network_getaddresses: getaddrinfo for db failed: Temporary failure in name resolution in /var/www/html/ts/itsm.php on line 12

Fatal error: Uncaught mysqli_sql_exception: php_network_getaddresses: getaddrinfo for db failed: Temporary failure in name resolution in /var/www/html/ts/itsm.php:12 Stack trace: #0 /var/www/html/ts/itsm.php(12): mysqli->__construct('db', 'itsm_user', Object(SensitiveParameterValue), 'itsm') #1 /var/www/html/itsm.php(31): require_once('/var/www/html/t...') #2 {main} thrown in /var/www/html/ts/itsm.php on line 12