how to draw multiple line into flot chart?

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i'm trying to draw multiple line into flot chart, my chart data is dynamic from database mysql, and the chart get data every 2 seconds, i'm successfull draw 1 line chart, but i'm trying to get multiple line in chart, how to draw multiple chart in flot chart with json ?

chart.php

 $(document).ready(function () {      

setInterval(function(){
        $.ajax({
            dataType:'json',  /*to avoid calling JSON.parse(data) in your callback function*/
            url: 'chart-data.php',
            success: function (data) {
console.log(data);//as mentioned in comments
                //1.either call plot again 
/*calling plot as seen in your code - start*/
                var d1 = data;/* JSON.parse(data) */
                $.plot($("#placeholder"), [{
                    label: "Number of items",
                    data: d1,
                    color: "#FB0026"
                }], {
                    xaxis: {
                        show: true,
                        axisLabel: "1hr",
                        ticks: 6
                    },
                    yaxis: {
                        show: true,
                        axisLabel: "",
                        ticks: 12,
                        min: 0,
                        tickDecimals: 0,
                        position: 1
                    }
                });

    plot.setData(newData);
    plot.setupGrid(); //only necessary if your new data will change the axes or grid
    plot.draw();
    */
            }//ajax props
        });//ajax
      },2000);//interval
    });//document ready

chart-data.php

 $query = "SELECT MONTH,days FROM high";
    $result = mysql_query($query);        


    while($row = mysql_fetch_assoc($result))
    {   
        $int = $row['days'];
        $join = intval($int);
        $int2 = $row['MONTH'];
        $join2 = intval($int2);
        $dataset1[] = array($join2,$join);

    }

    $final = json_encode($dataset1);
echo $final;

output chart

i'm trying draw 2 line like this

asked 42 secs ago

user3123347

16

how to draw multiple line into flot chart?