Warning: mysql_connect(): php_network_getaddresses: getaddrinfo failed: hostname nor servname provided, or not known in /www/vanwaardenburgit/sjoerd/webmeester/Includes/PHP/connect_mysql.php on line 13

Warning: mysql_connect(): php_network_getaddresses: getaddrinfo failed: hostname nor servname provided, or not known in /www/vanwaardenburgit/sjoerd/webmeester/Includes/PHP/connect_mysql.php on line 13
I cannot connect to the database because: php_network_getaddresses: getaddrinfo failed: hostname nor servname provided, or not known