高图轴值

我用Highcharts制作图表，效果很好。

但是现在我想要mysql结果的值。我尝试的是这样的:

xAxis: {
    dateTimeLabelFormats: {
        month: '%b'   
    }

data: [<?
    //verkoopfacturen tot 30 dagem oud
    $query = "SELECT SUM(VerkoopfactBedrag) AS bedrag, DATE_FORMAT(VerkoopfactDatum, '%m') AS date
    FROM verkoopfacturen WHERE Verkoopfact_UserId = {$_COOKIE['customer_id']} AND VerkoopfactDatum BETWEEN '{$year}-01-01' AND '{$year}-12-30'
    GROUP BY MONTH(VerkoopfactDatum)";
    $sql = mysql_query("$query"); 
    while ($fill = mysql_fetch_array($sql)) 
    { 
        $bedrag = $fill['bedrag'];
        $date = $fill['date'];

        echo '[';
        echo $date.',';
        echo $bedrag;
        echo '],';
    }
    ?>]

问题是现在我得到的月份是小数