如何将值从html传递到php中的xpath表达式？

<form action="process.php" method="post">
  <input type="text" name="input_value" placeholder="Enter a value">
  <input type="submit" value="Submit">
</form>

<?php
$inputValue = $_POST['input_value']; // 获取HTML表单中的值

// 构造XPath表达式，将获取的值插入到表达式中
$xpathExpression = "//div[contains(text(), '$inputValue')]";

// 加载HTML文档
$dom = new DOMDocument();
$dom->loadHTMLFile('your_html_file.html');

// 创建DOMXPath对象并执行XPath查询
$xpath = new DOMXPath($dom);
$result = $xpath->query($xpathExpression);

// 处理查询结果
if ($result->length > 0) {
  foreach ($result as $node) {
    // 处理匹配到的元素
    echo $node->nodeValue . "<br>";
  }
} else {
  echo "No matching elements found.";
}
?>