如何将文字说明和二维码一起作为PNG图片下载？

<title>工位信息填报</title><meta content="width=device-width, initial-scale=1.0" name="viewport"></meta><link href="../css/qrcode.css" rel="stylesheet"></link>
<?php
// 连接MySQL数据库
$con = mysqli_connect("localhost", "root", "zsc%1234", "textplain");
if (!$con) {
    echo "连接数据库失败";
}
// 查询语句
$sql = "select * from station";
// 执行查询
$result = mysqli_query($con, $sql);
// 获取结果
$employee_list = mysqli_fetch_all($result, MYSQLI_ASSOC);

foreach ($employee_list as $employee) {
    // 构建二维码URL
    $qr_url = $employee['username'] && $employee['workorder'] ?
        "http://localhost/myweb/stationmanagementsystem/html/getinformation.php?stationum=" . urlencode($employee['stationum']) . "&bulid=" . urlencode($employee['bulid']) . "&floor=" . urlencode($employee['floor']) . "&username=" . urlencode($employee['username']) . "&workorder=" . urlencode($employee['workorder']) :
        "http://localhost/myweb/stationmanagementsystem/html/getinformation.php?stationum=" . urlencode($employee['stationum']) . "&bulid=" . urlencode($employee['bulid']) . "&floor=" . urlencode($employee['floor']);

    // 输出二维码容器及文字说明
    echo '<div class="qrcode-container" style="position: relative; display: inline-block;">';
    echo '<div id="qrcode-' . $employee['stationum'] . '"></div>';
    echo '<div class="qrcode-label">' . $employee['stationum'] . '</div>';
    echo '</div>';

    // JavaScript代码 (需放在<script>标签内)
    echo "<script>";
    echo "var size = 256; // 二维码大小";
    echo "new QRCode('qrcode-" . $employee['stationum'] . "', {";
    echo "text: '" . $qr_url . "',";
    echo "width: size,";
    echo "height: size,";
    echo "colorDark : '#000000',";
    echo "colorLight : '#ffffff',";
    echo "correctLevel : QRCode.CorrectLevel.H";
    echo "});";
    echo "// 使用html2canvas生成图片";
    echo "html2canvas(document.querySelector('.qrcode-container'), { useCORS: true, allowTaint: true }).then(function(canvas) {";
    echo "canvas.toBlob(function(blob) { saveAs(blob, '" . $employee['stationum'] . ".png'); });";
    echo "});";
    echo "</script>";
}
mysqli_close($con);
?>