$mysql_host = "localhost";
    $mysql_database = "nome_base_de_dados";
    $mysql_user = "user_bd";
    $mysql_pass = "pass_bd";


    $conn = new mysqli($mysql_host, $mysql_user, $mysql_pass, $mysql_database);
    if ($conn->connect_errno) {
        $code = $conn->connect_errno;
        $message = $conn->connect_error;
        printf("<p>Connection error: %d %s</p>", $code, $message);
    }