来源 | https://www.geeksforgeeks.org/how-to-make-dynamic-chart-in-php-using-canvasjs/
CanvasJS是一个JavaScript库，用于轻松为网页创建其他类型的图表。例如条形图，饼图，柱形图，面积图，折线图等。
让我们以需要创建一个图表的示例为例，在该图表中我们可以显示每月销售和购买的产品。我们将考虑两个数组，我们也可以从数据库中考虑它们。一旦我们从数据库中获取数据并将其存储在数组中，它就可以使用canvasJS轻松绘制动态图形。
创建一个文件并将其保存在项目文件夹中。文件名chart_sample.php包含数组形式的数据，其中第一个数组代表购买的产品，第二个数组代表sols产品列表。现在，使用canvasJS绘制图形。
例如：
<?php
// First array for purchased product
$purchased= array(10, 15, 19, 0, 5, 7, 0, 0, 12, 13, 10, 1);
// Second array for sold product
$sold= array(7, 12, 14, 0, 3, 7, 0, 0, 10, 7, 5, 0);
// Data to draw graph for purchased products
$dataPoints = array(
array("label"=> "Jan", "y"=> $purchased[0]),
array("label"=> "Feb", "y"=> $purchased[1]),
array("label"=> "March", "y"=> $purchased[2]),
array("label"=> "April", "y"=> $purchased[3]),
array("label"=> "May", "y"=> $purchased[4]),
array("label"=> "Jun", "y"=> $purchased[5]),
array("label"=> "July", "y"=> $purchased[6]),
array("label"=> "Aug", "y"=> $purchased[7]),
array("label"=> "Sep", "y"=> $purchased[8]),
array("label"=> "Oct", "y"=> $purchased[9]),
array("label"=> "Nov", "y"=> $purchased[10]),
array("label"=> "Dec", "y"=> $purchased[11])
);
// Data to draw graph for sold products
$dataPoints2 = array(
array("label"=> "Jan", "y"=> $sold[0]),
array("label"=> "Feb", "y"=> $sold[1]),
array("label"=> "March", "y"=> $sold[2]),
array("label"=> "April", "y"=> $sold[3]),
array("label"=> "May", "y"=> $sold[4]),
array("label"=> "Jun", "y"=> $sold[5]),
array("label"=> "July", "y"=> $sold[6]),
array("label"=> "Aug", "y"=> $sold[7]),
array("label"=> "Sep", "y"=> $sold[8]),
array("label"=> "Oct", "y"=> $sold[9]),
array("label"=> "Nov", "y"=> $sold[10]),
array("label"=> "Dec", "y"=> $sold[11])
);
?>
<!DOCTYPE HTML>
<html>
<head>
<script src="https://canvasjs.com/assets/script/canvasjs.min.js">
</script>
<script>
window.onload = function () {
var chart = new CanvasJS.Chart("chartContainer", {
animationEnabled: true,
title:{
text: "Monthly Purchased and Sold Product"
},
axisY: {
title: "Purchased",
titleFontColor: "#4F81BC",
lineColor: "#4F81BC",
labelFontColor: "#4F81BC",
tickColor: "#4F81BC"
},
axisY2: {
title: "Sold",
titleFontColor: "#C0504E",
lineColor: "#C0504E",
labelFontColor: "#C0504E",
tickColor: "#C0504E"
},
toolTip: {
shared: true
},
legend: {
cursor:"pointer",
itemclick: toggleDataSeries
},
data: [{
type: "column",
name: "Purchased",
legendText: "Purchased",
showInLegend: true,
dataPoints:<?php echo json_encode($dataPoints,
JSON_NUMERIC_CHECK); ?>
},
{
type: "column",
name: "Sold",
legendText: "Sold",
axisYType: "secondary",
showInLegend: true,
dataPoints:<?php echo json_encode($dataPoints2,
JSON_NUMERIC_CHECK); ?>
}]
});
chart.render();
function toggleDataSeries(e) {
if (typeof(e.dataSeries.visible) === "undefined"
|| e.dataSeries.visible) {
e.dataSeries.visible = false;
}
else {
e.dataSeries.visible = true;
}
chart.render();
}
}
</script>
</head>
<body>
<div id="chartContainer" style="height: 300px; width: 100%;"></div>
</body>
</html>
结果如下：
