使用JSON数据过滤图。（来自数据库）

Question

使用按钮“ $ Post”方法过滤数据。 必须选择两个日期，它将用于过滤JSON数据。

我有两个密码。
streamchart.php -显示json数据的地方。
stream.php -在图表中显示数据。

  

我的问题是如何根据日期范围过滤json数据？   

Stream.php

<?php
include ('connection/conn.php');



$sth = mysqli_query($conn, "SELECT val FROM tbl_streamflow WHERE araw = '2018-11-18'");
$rows = array();
$rows['name'] = 'Previous';
while($r = mysqli_fetch_array($sth)) {
$rows['data'][] = $r['val'];
}


$sth1 = mysqli_query($conn, "SELECT val FROM tbl_streamflow WHERE araw = '2018-11-26'");
$rows1 = array();
$rows1['name'] = 'Current';
while($rr = mysqli_fetch_assoc($sth1)) {
$rows1['data'][] = $rr['val'];
}

$result = array();
array_push($result,$rows);
array_push($result,$rows1);
//print json_encode($result, JSON_NUMERIC_CHECK);
echo json_encode($result, JSON_NUMERIC_CHECK);

?>

StreamChart.php

<script type="text/javascript">
            $(function () {
            var chart;
            $(document).ready(function() {
            $.getJSON("streamchart.php", function(json) {

            chart = new Highcharts.Chart({
            chart: {
            renderTo: 'container',
            type: 'spline',

            marginRight: 130,
            marginBottom: 25
            },


            title: {
            text: 'StreamFlow Discharge Previous (Nov.18.2018) vs. Current (Nov.26.2018)',
            style: { "color": "#333333", "fontSize": "25px" },
            x: -20 //center
            },
            subtitle: {
            text: 'StreamFlow Discharge Result',
            x: -20
            },
            xAxis: {
            categories: ['SW-009', 'SW-028', 'SW-029', 'SW-010', 'SW-001', 'SW-007', 'SW-012']
            },
            yAxis: {
            title: {
                 style: { "color": "#333333", "fontSize": "15px" },
            text: 'Discharge m3/s'
            },



            plotLines: [{
            value: 0,
            width: 1,
            color: '#808080'
            }]
            },
            tooltip: {
                crosshairs: true,
                shared: true
            },
            plotOptions: {
                spline: {
                    marker: {
                        radius: 4,
                        lineColor: '#666666',
                        lineWidth: 1
                    }
                }
            },
            legend: {
            layout: 'vertical',
            align: 'right',
            verticalAlign: 'top',
            x: -10,
            y: 100,
            borderWidth: 0
            },
            series: json
            });
            });

            });

            });
        </script>
<div id="container" style="min-width: 310px; height: 400px; margin: 0 auto"></div>

Stream.php

请帮助我。谢谢！