为什么我在 php 中发送电子邮件时得到 html 代码？

Question

您好，我正在为我的项目开发一个忘记密码的 php 系统。 我想向我的用户发送一封电子邮件，以便他们可以单击链接重置密码。 但是当我打开收件箱时，我得到的是 html 文本而不是链接。 我尝试了其他方法，例如在消息中添加标头，但它仍然是 html 代码。 这是我的代码：

<?php 

$errors = [];
$user_id = "";
$db = mysqli_connect('localhost', 'root', 'mySQLpassword',      'registration');

if (isset($_POST['login_user'])) {
  $user_id = mysqli_real_escape_string($db, $_POST['user_id']);
  $password = mysqli_real_escape_string($db, $_POST['password']);
  if (empty($user_id)) array_push($errors, "Username or Email is required");
  if (empty($password)) array_push($errors, "Password is required");

  if (count($errors) == 0) {
    $password = md5($password);
    $sql = "SELECT * FROM users WHERE username='$user_id' OR email='$user_id' AND password='$password'";
    $results = mysqli_query($db, $sql);

    if (mysqli_num_rows($results) == 1) {
      $_SESSION['username'] = $user_id;
      $_SESSION['success'] = "You are now logged in";
      header('location: index.php');
    }else {
      array_push($errors, "Wrong credentials");
    }
  }
}

if (isset($_POST['reset-password'])) {
  $email = mysqli_real_escape_string($db, $_POST['email']);
  
query = "SELECT email FROM users WHERE email='$email'";
  $results = mysqli_query($db, $query);

  if (empty($email)) {
    array_push($errors, "Your email is required");
  }else if(mysqli_num_rows($results) <= 0) {
    array_push($errors, "Sorry, no user exists on our system with that email");
  }
  $token = bin2hex(random_bytes(50));

  if (count($errors) == 0) {
    $sql = "INSERT INTO password_reset(email, token) VALUES ('$email', '$token')";
    $results = mysqli_query($db, $sql);

    $to = $email;
    $subject = "Reset your password";
    $msg = "Hi there, click on this <a href=\"new_password.php?token=" . $token . "\">link</a> to reset your password on our site";
    $msg = wordwrap($msg,70);
    $headers = "From: info@gmail.com";
    mail($to, $subject, $msg, $headers);
    header('location: pending.php?email=' . $email);
  }
}

if (isset($_POST['new_password'])) {
  $new_pass = mysqli_real_escape_string($db, $_POST['new_pass']);
  $new_pass_c = mysqli_real_escape_string($db, $_POST['new_pass_c']);

  $token = $_SESSION['token'];
  if (empty($new_pass) || empty($new_pass_c)) array_push($errors, "Password is required");
  if ($new_pass !== $new_pass_c) array_push($errors, "Password do not match");
  if (count($errors) == 0) {
    $sql = "SELECT email FROM password_reset WHERE token='$token' LIMIT 1";
    $results = mysqli_query($db, $sql);
    $email = mysqli_fetch_assoc($results)['email'];

    if ($email) {
      $new_pass = md5($new_pass);
      $sql = "UPDATE users SET password='$new_pass' WHERE email='$email'";
      $results = mysqli_query($db, $sql);
      header('location: index.php');
    }
  }
}
?>

任何帮助都将被排除在外！

Answer 1

要发送 HTML 邮件，必须设置 Content-type 标头。

勾选mail documentation中的“Example #5 Sending HTML email”。

例子（这里$headers是一个数组）：

$headers[] = 'Content-Type: text/html; charset=UTF-8';