php - 使用过滤器创建条形图

Question

我为快速移动和缓慢移动的产品创建了一个条形图。我已经加载了图表，但是当我按月过滤图表时，图像将不再显示。

我认为$_POST方法会导致错误，因为当我将静态值放入查询时，图形图像会显示。

这是我的代码。

<?php include("phpgraphlib.php");
$graph=new PHPGraphLib(550,350);
include('myConnection.php'); 
$month = $_POST["month"];
$year = $_POST["year"];

$sql="SELECT menu_name, COUNT( * ) AS  'count'
FROM orders_menu AS om
INNER JOIN menu AS m ON m.menu_id_inc = om.menu_id_inc
WHERE MONTH(om.date_orderedmenu) =  '$month'
AND YEAR(om.date_orderedmenu) =  '$year'
GROUP BY menu_name";

$result = mysql_query($sql) or die('Query failed: ' . mysql_error());
$dataArray=array();
if ($result) {

    while ($row = mysql_fetch_assoc($result)) {
        $menu=$row["menu_name"];
        $count=$row["count"];

        $dataArray[$menu]=$count;
        arsort($dataArray);
        array_slice($dataArray, 0,5); 
    }
}


$graph->addData($dataArray);
$graph->setDataValues(true);    
$graph->setTitle("Fast Moving Dishes");
$graph->setGradient("green", "olive");
$graph->setBarOutlineColor("black");
$graph->createGraph();
?>