Generating Visual Statistical Charts with PHP and ECharts
This tutorial explains how to retrieve data from a MySQL database using PHP, process it, and render interactive bar charts with the ECharts library, providing step‑by‑step instructions, sample code, and best practices for creating data visualizations in web applications.
In the era of increasing importance of data visualization, developers often need to quickly generate charts and reports to help decision makers interpret data. This article demonstrates how to use a PHP interface together with the ECharts library to create visual statistical charts.
Implementation Steps:
1. Preparation
Ensure PHP, MySQL, and the ECharts library are installed. ECharts can be downloaded from http://echarts.baidu.com/index.html or included via CDN:
<script src="https://cdn.bootcdn.net/ajax/libs/echarts/5.2.1/echarts.min.js"></script>2. Retrieve Data from MySQL
Connect to a MySQL database (e.g., test_db) and fetch records from a user table containing name and age fields.
<?php
$dbname = 'test_db';
$host = 'localhost';
$user = 'root';
$password = '';
$conn = mysqli_connect($host, $user, $password, $dbname);
if (!$conn) {
die("Connection failed: " . mysqli_connect_error());
}
$sql = "SELECT * FROM user";
$result = mysqli_query($conn, $sql);
$data = array();
if (mysqli_num_rows($result) > 0) {
while ($row = mysqli_fetch_assoc($result)) {
$data[] = array('name' => $row['name'], 'age' => (int)$row['age']);
}
}
mysqli_close($conn);
?>The script establishes a database connection, queries all rows from the user table, and stores the results in an array.
3. Generate ECharts Chart
Using the retrieved data, a bar chart is created. The example below shows an HTML page that initializes ECharts, defines a chart option, and fills the series data based on age ranges.
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Bar Chart</title>
<script src="https://cdn.bootcdn.net/ajax/libs/echarts/5.2.1/echarts.min.js"></script>
</head>
<body>
<!-- Chart container -->
<div id="main" style="width: 600px;height:400px;"></div>
<script type="text/javascript">
var myChart = echarts.init(document.getElementById('main'));
var option = {
title: { text: 'User Age Distribution' },
tooltip: {},
legend: { data: ['Age'] },
xAxis: { data: ['Under 18','19-25','26-35','36-45','46+'] },
yAxis: {},
series: [{ name: 'Age', type: 'bar', data: [] }]
};
option.series[0].data = [
{ value: 0, name: 'Under 18' },
{ value: 0, name: '19-25' },
{ value: 0, name: '26-35' },
{ value: 0, name: '36-45' },
{ value: 0, name: '46+' }
];
<?php
foreach ($data as $v) {
if ($v["age"] < 18) {
echo "option.series[0].data[0].value = option.series[0].data[0].value+1;";
}
if ($v["age"] >= 19 && $v["age"] <= 25) {
echo "option.series[0].data[1].value = option.series[0].data[1].value+1;";
}
if ($v["age"] >= 26 && $v["age"] <= 35) {
echo "option.series[0].data[2].value = option.series[0].data[2].value+1;";
}
if ($v["age"] >= 36 && $v["age"] <= 45) {
echo "option.series[0].data[3].value = option.series[0].data[3].value+1;";
}
if ($v["age"] > 45) {
echo "option.series[0].data[4].value = option.series[0].data[4].value+1;";
}
}
?>
myChart.setOption(option);
</script>
</body>
</html>The PHP loop iterates over the fetched data, increments the appropriate age‑group counters, and injects JavaScript statements that update the ECharts option. When the page loads, ECharts renders a bar chart reflecting the distribution of ages in the database.
Conclusion
We have successfully demonstrated how to combine a PHP backend with the ECharts library to produce visual statistical charts. In real projects you can choose different chart types, customize styles, and separate data and configuration files for better maintainability.
This guide should help you quickly create various visualizations using PHP and ECharts.
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