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PHP and JS Practical Combat: Stock Candle Chart Drawing Tutorial

王林Original: 2023-12-17 11:21:46697browse

The visualization of stock trading data has always been one of the important tasks in the financial field. Candlestick charts are one of the most commonly used stock trading trend analysis charts. This tutorial explains how to draw stock candlesticks using PHP and JS, and provides specific code examples.

1. Preparation
First, we need to prepare some stock transaction data, including date, opening price, highest price, lowest price and closing price. The data can come from a CSV file or a database. Here we assume that the data has been saved in the database.

2. Draw candle charts

PHP code part
First, we need to obtain the stock transaction data from the database and process the data. The specific code is as follows:

<?php
// 连接数据库
$connect = mysqli_connect("localhost", "username", "password", "database");

// 获取股票交易数据
$query = "SELECT * FROM stock_data";
$result = mysqli_query($connect, $query);

// 定义数组来存储数据
$data = array();

// 处理数据
while($row = mysqli_fetch_assoc($result)) {
    $data[] = array(
        "date" => $row["date"],
        "open" => $row["open"],
        "high" => $row["high"],
        "low" => $row["low"],
        "close" => $row["close"]
    );
}

// 关闭数据库连接
mysqli_close($connect);
?>

In the code, we use the mysqli function to connect to the database and execute the query statement to obtain data. Then, we define an array $data to store data, and use a while loop to store the data into the array.

JS code part
Next, we use JavaScript to draw the candle chart. The specific code is as follows:

<!DOCTYPE html>
<html>
<head>
    <title>Stock Candlestick Chart</title>
    <script src="https://cdn.jsdelivr.net/npm/apexcharts"></script>
</head>
<body>
    <div id="chart"></div>

    <script>
        var options = {
            series: [{
                data: [
                    <?php
                    foreach($data as $row) {
                        echo "{ x: new Date('" . $row["date"] . "'), y: [" . $row["open"] . ", " . $row["high"] . ", " . $row["low"] . ", " . $row["close"] . "] },";
                    }
                    ?>
                ]
            }],
            chart: {
                type: 'candlestick',
                height: 350
            },
            title: {
                text: 'Stock Candlestick Chart'
            },
            xaxis: {
                type: 'datetime'
            },
            yaxis: {
                tooltip: {
                    enabled: true
                }
            }
        };

        var chart = new ApexCharts(document.querySelector("#chart"), options);
        chart.render();
    </script>
</body>
</html>

In the code, we use the ApexCharts library to draw candle charts. In options, we pass the stock transaction data into the data attribute of the series and use a foreach loop to generate JS code. Use date data on the x-axis and stock transaction data on the y-axis. Other configuration items include chart type, title, x-axis and y-axis settings.

3. Usage Example
Save the above PHP code as "index.php", access the file through the browser, and you can view the drawing results of the stock candle chart.

4. Summary
This tutorial introduces how to use PHP and JS to draw stock candle charts, and provides specific code examples. Stock candle charts can help us understand stock trading trends more intuitively and facilitate us to make corresponding analysis and decisions. By learning and mastering this tutorial, we can better apply PHP and JS technology to realize the visual display of stock data.

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