如何用PHP和XML实现网站的在线调查和投票

<?xml version="1.0" encoding="UTF-8"?>
<survey>
  <question>
    <text>您觉得哪种颜色更好看？</text>
    <options>
      <option>红色</option>
      <option>蓝色</option>
      <option>绿色</option>
    </options>
  </question>
  <question>
    <text>您更倾向于什么类型的电影？</text>
    <options>
      <option>动作片</option>
      <option>喜剧片</option>
      <option>爱情片</option>
    </options>
  </question>
</survey>

<?php
  // 载入XML文件
  $xml = simplexml_load_file('survey.xml');

  // 显示调查问题和选项
  foreach ($xml->question as $question) {
    echo "<h3>{$question->text}</h3>";
    echo "<ul>";
    foreach ($question->options->option as $option) {
      echo "<li><input type='radio' name='{$question->text}' value='{$option}'> {$option}</li>";
    }
    echo "</ul>";
    echo "<br>";
  }
  // 提交按钮
  echo "<input type='submit' value='提交'>";
?>

<?php
  if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    // 获取用户的投票结果
    $voteResults = $_POST;

    // 载入XML文件
    $xml = simplexml_load_file('survey.xml');

    // 更新投票结果
    foreach ($xml->question as $question) {
      $selectedOption = $voteResults[$question->text];
      foreach ($question->options->option as $option) {
        if ((string) $option === $selectedOption) {
          $option['votes'] = (int) $option['votes'] + 1;
        }
      }
    }

    // 保存更新后的XML文件
    $xml->asXML('survey.xml');

    // 投票成功提示消息
    echo "您的投票已成功提交！";
  }
?>