Warning: mysqli_connect(): php_network_getaddresses: getaddrinfo for failed: Name or service not known in /var/www/html/classes/adatbazis.php on line 22

Fatal error: Uncaught mysqli_sql_exception: php_network_getaddresses: getaddrinfo for failed: Name or service not known in /var/www/html/classes/adatbazis.php:22 Stack trace: #0 /var/www/html/classes/adatbazis.php(22): mysqli_connect(':', '', '') #1 /var/www/html/index.php(31): Adatbazis->kapcsolodas() #2 {main} thrown in /var/www/html/classes/adatbazis.php on line 22