<form action="send_email.php" method="post">
  <input type="checkbox" name="interests[]" value="web"> Web开发
  <input type="checkbox" name="interests[]" value="mobile"> 移动开发
  <input type="checkbox" name="interests[]" value="ai"> 人工智能
  <!-- 其他复选框 -->
  <input type="submit" value="提交">
</form>

<?php
$to = "your_email@example.com";
$subject = "复选框值";
$message = "";

if(isset($_POST['interests'])){
  $interests = $_POST['interests'];
  $message .= "用户选择的兴趣爱好：\n";
  foreach($interests as $interest){
    $message .= "- " . $interest . "\n";
  }
}

$headers = "From: sender@example.com";

// 使用mail()函数发送电子邮件
mail($to, $subject, $message, $headers);
?>