如何将 html 内容添加到此 Sendgrid 的代码中？

Question

SendGrid-PHP 库进行了一些更新。请参阅自述文件中的示例：https://github.com/sendgrid/sendgrid-php

<?php
// If you are using Composer
require 'vendor/autoload.php';

// If you are not using Composer (recommended)
// require("path/to/sendgrid-php/sendgrid-php.php");

$from = new SendGrid\Email(null, "test@example.com");
$subject = "Hello World from the SendGrid PHP Library!";
$to = new SendGrid\Email(null, "test@example.com");
$content = new SendGrid\Content("text/plain", "Hello, Email!");
$mail = new SendGrid\Mail($from, $subject, $to, $content);

$apiKey = getenv('SENDGRID_API_KEY');
$sg = new \SendGrid($apiKey);

$response = $sg->client->mail()->send()->post($mail);
echo $response->statusCode();
echo $response->headers();
echo $response->body();

我要添加html内容，而不是纯文本，如何改代码？

Answer 1

要发送html，这一行：

$content = new SendGrid\Content("text/plain", "Hello, Email!");

必须如下：

$content = new SendGrid\Content("text/html", "Hello, Email!");
//                                    ^^^^

更多详情，请查看example

---

更新

手动发送混合的 html 和纯文本电子邮件：

$boundary = uniqid('np');
$content = new SendGrid\Content("multipart/alternative;boundary=" . $boundary, "Hello, Email!");