[php/mysql] Mysql geeft error 2006

function send_mail($email_var_ary, $template_name, $subject, $bcc_list_ary)
{
    global $config, $user, $phpbb_root_path;

    // Sixty second limit
    @set_time_limit(60);

    //
    // Let's do some checking to make sure that mass mail functions
    // are working in win32 versions of php.
    //
    if (preg_match('/[c-z]:\\\.*/i', getenv('PATH')) && !$config['smtp_delivery'])
    {
        $ini_val = (@phpversion() >= '4.0.0') ? 'ini_get' : 'get_cfg_var';
        // We are running on windows, force delivery to use our smtp functions
        // since php's are broken by default
        $config['smtp_delivery'] = 1;
        $config['smtp_host'] = @$ini_val('SMTP');
    }

    if(!is_array($email_var_ary)){$email_var_ary=array();}
    if (sizeof($bcc_list_ary))
    {
        include($phpbb_root_path . './includes/functions_messenger.php');
        $emailer = new messenger(FALSE);

        $script_name = preg_replace('/^\/?(.*?)\/?$/', '\1', trim($config['script_path']));
//      $script_name = ($script_name == '') ? $script_name . "?area=viewtopic" : '';
        $server_name = trim($config['server_name']);
        $server_protocol = ($config['cookie_secure']) ? 'https://' : 'http://';
        $server_port = ($config['server_port'] <> 80) ? ':' . trim($config['server_port']) . '/' : '/';
        $emailer->from($config['board_email']);
        $emailer->replyto($config['board_email']);

        @reset($bcc_list_ary);
        while (list($bcc_list,$user_lang) = each($bcc_list_ary))
        {
            $emailer->template($template_name, $user_lang);
            $emailer->bcc($bcc_list);

            // The Topic_reply_notification lang string below will be used
            // if for some reason the mail template subject cannot be read
            // ... note it will not necessarily be in the posters own language!
            $emailer->subject("\n $subject");

            // This is a nasty kludge to remove the username var ... till (if?)
            // translators update their templates
            $emailer->msg = preg_replace('#[ ]?{USERNAME}#', '', $emailer->msg);
            $temp=array(    'L_USERNAME'    => $user->data['username'], );
            $email_var_ary = array_merge($email_var_ary,$temp);
            $emailer->assign_vars($email_var_ary);
            if(!($result=$emailer->send(NOTIFY_EMAIL)))
            {
                echo $result;
            }
        }
    }
}

if(isset($_POST['send']))
{
        $sql = '';//een sql string
        if( !($result = $db->sql_query($sql)))
        {
            message_die(GENERAL_ERROR, 'Could not insert new user data', '', __LINE__, __FILE__);
        }

        $sql_uid =  $db->sql_nextid();

        for($i=1;$i<=$tmp['car_count'];$i++)
        {
            $sql = "'";//een sql string
            if( !($result = $db->sql_query($sql)))
            {
                message_die(GENERAL_ERROR, 'Could not insert new car data', '', __LINE__, __FILE__);
            }
        }
//disconnect from db
$db->sql_close();
// hier faalt hij
        send_mail(array(    'een'=>'array'),'rotary','Nieuwe registratie',array('naam@domain.extentie'=>'nl'));
// reConnect to DB
require($phpbb_root_path . 'config.' . $phpEx);
$db->sql_connect($dbhost, $dbuser, $dbpasswd, $dbname, $dbport, false, defined('PHPBB_DB_NEW_LINK') ? PHPBB_DB_NEW_LINK : false);
unset($dbpasswd);unset($dbhost);unset($dbuser);unset($dbname);unset($dbport);
        $template->display('page');
        return;
    }
}

if(!$db->db_connect_id)
{
    // reConnect to DB
    global $phpbb_root_path, $phpEx;
    include($phpbb_root_path . 'config.' . $phpEx);
    $db->sql_connect($dbhost, $dbuser, $dbpasswd, $dbname, $dbport, false, false);
    unset($dbpasswd,$dbhost,$dbuser,$dbname,$dbport);
}