How to iterate database values by date for google charts - php

Question

I have seen similar questions but still do not understand how it woks.. I have this while loop looping my DB for dates, leads and sold. For each date in the DB I would like to show the daily leads and sold for each date in the DB in a line chart.
$sql = "SELECT * FROM customers WHERE source = 'website' ORDER BY date ASC";
$result = $conn->query($sql);
if ($result->num_rows > 0) {
while($row = $result->fetch_assoc()) {
$sold = $row['sold'];
$visit= $row['visit'];
$date= $row['date'];
}else{
}
}
Here is the chart script -
<script type="text/javascript">
google.charts.setOnLoadCallback(drawChartl);
function drawChartl() {
var data = google.visualization.arrayToDataTable([
['Date', 'Leads', 'Sold'],
['1st', 6, 2],
['2nd', 3, 1],
['3rd', 2, 3],
]);
var options = {
title: 'Internet Performance',
curveType: 'function',
legend: { position: 'top' }
};
var chart = new google.visualization.LineChart(document.getElementById('curve_chart'));
chart.draw(data, options);
}
</script>
<div id="curve_chart" style="width: 1900px; height: 500px"></div>

Answer 1

see following snippet...
need an array that holds all the data --> $json
then add each row to $json --> $dataRow
then write the result to the javascript --> data.addRows(<?= $jsonstring ?>);
try something like this, probably need to format the date too...
<?php
$json = array();
$sql = "SELECT * FROM customers WHERE source = 'website' ORDER BY date ASC";
$result = $conn->query($sql);
if ($result->num_rows > 0) {
while($row = $result->fetch_assoc()) {
$dataRow = array(
$row['date'],
$row['visit'],
$row['sold']
);
array_push($json, $dataRow);
}
}
$jsonstring = json_encode($json);
?>
<script src="https://www.gstatic.com/charts/loader.js"></script>
<script type="text/javascript">
google.charts.load('current', {
'callback': function () {
var data = google.visualization.arrayToDataTable([
[{type: 'string', label: 'Date'}, {type: 'number', label: 'Leads'}, {type: 'number', label: 'Sold'}]
]);
data.addRows(<?= $jsonstring ?>);
var options = {
title: 'Internet Performance',
curveType: 'function',
legend: { position: 'top' }
};
var chart = new google.visualization.LineChart(document.getElementById('curve_chart'));
chart.draw(data, options);
},
'packages': ['corechart']
});
</script>
<div id="curve_chart" style="width: 1900px; height: 500px"></div>