Warning: mysqli::__construct(): php_network_getaddresses: getaddrinfo for db failed: Name or service not known in /var/www/sft/htdocs/config.php on line 15

Fatal error: Uncaught mysqli_sql_exception: php_network_getaddresses: getaddrinfo for db failed: Name or service not known in /var/www/sft/htdocs/config.php:15 Stack trace: #0 /var/www/sft/htdocs/config.php(15): mysqli->__construct() #1 /var/www/sft/htdocs/orario.php(13): require_once('...') #2 {main} thrown in /var/www/sft/htdocs/config.php on line 15