如何为要保存在MySQL数据库中的DOMDocument XML的每个元素添加引号

<?php
// 加载XML文档
$xml = new DOMDocument();
$xml->load('your_xml_file.xml');

// 获取所有元素
$elements = $xml->getElementsByTagName('*');

// 遍历元素并添加引号
foreach ($elements as $element) {
    $text = $element->nodeValue;
    $quotedText = '"' . $text . '"';
    $element->nodeValue = $quotedText;
}

// 将更新后的DOM对象保存到MySQL数据库
$mysqlHost = 'your_mysql_host';
$mysqlUser = 'your_mysql_user';
$mysqlPassword = 'your_mysql_password';
$mysqlDatabase = 'your_mysql_database';

$mysqli = new mysqli($mysqlHost, $mysqlUser, $mysqlPassword, $mysqlDatabase);
if ($mysqli->connect_errno) {
    die('Failed to connect to MySQL: ' . $mysqli->connect_error);
}

// 将DOM对象转换为字符串
$xmlString = $xml->saveXML();

// 执行MySQL插入操作
$query = "INSERT INTO your_table (xml_data) VALUES ('$xmlString')";
if ($mysqli->query($query)) {
    echo 'XML data inserted into MySQL successfully.';
} else {
    echo 'Failed to insert XML data into MySQL: ' . $mysqli->error;
}

// 关闭数据库连接
$mysqli->close();
?>