I can't connect to MySQL database, I triple checked that the credentials were correct and even contacted support from hosting: they told that it is probably a mistake in the MySql syntax- it works perfectly on local server but not online.
Do you see something suspicious?
$DB_HOST="";
$DB_USER="";
$DB_PASSWORD="";
$DB_DATABASE="";
define("DB_HOST", "localhost");
define("DB_USER", "utente");
define("DB_PASSWORD", "password");
define("DB_DATABASE", "database");
$connessDB=mysqli_connect($DB_HOST,$DB_USER,$DB_PASSWORD,$DB_DATABASE);
$toDB=mysqli_query($connessDB,"INSERT INTO utenti (nome, eta, citta, paese, mail, password, username) VALUES ('nome','eta','citta','paese','mail','password','username')");