php 生成rss

<?php
header('Content-Type: application/rss+xml; charset=utf-8');

echo '<?xml version="1.0" encoding="UTF-8"?>';
?>
<rss version="2.0">
    <channel>
        <title>My Blog</title>
        <link>http://example.com</link>
        <description>Latest posts from My Blog</description>
        <language>en-us</language>

        <?php
        // 假设我们有一个文章数组
        $posts = [
            [
                'title' => 'First Post',
                'link' => 'http://example.com/posts/first-post',
                'description' => 'This is the first post on my blog.',
                'pubDate' => 'Mon, 01 Jan 2023 00:00:00 GMT'
            ],
            [
                'title' => 'Second Post',
                'link' => 'http://example.com/posts/second-post',
                'description' => 'This is the second post on my blog.',
                'pubDate' => 'Tue, 02 Jan 2023 00:00:00 GMT'
            ]
        ];

        foreach ($posts as $post) {
            echo '<item>';
            echo '<title>' . htmlspecialchars($post['title']) . '</title>';
            echo '<link>' . htmlspecialchars($post['link']) . '</link>';
            echo '<description>' . htmlspecialchars($post['description']) . '</description>';
            echo '<pubDate>' . htmlspecialchars($post['pubDate']) . '</pubDate>';
            echo '</item>';
        }
        ?>
    </channel>
</rss>