用php在电子邮件中发送表单字段

<form action="send_email.php" method="POST">
  <label for="name">姓名:</label>
  <input type="text" id="name" name="name">
  <br>
  <label for="email">电子邮件:</label>
  <input type="email" id="email" name="email">
  <br>
  <label for="message">消息:</label>
  <textarea id="message" name="message"></textarea>
  <br>
  <input type="submit" value="发送邮件">
</form>

<?php
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
  $name = $_POST['name'];
  $email = $_POST['email'];
  $message = $_POST['message'];

  $to = 'recipient@example.com';
  $subject = '表单提交';

  $email_content = "姓名: $name\n";
  $email_content .= "电子邮件: $email\n";
  $email_content .= "消息: $message\n";

  // 发送邮件
  mail($to, $subject, $email_content);

  // 输出成功消息或进行重定向等操作
  echo '邮件发送成功！';
}
?>