php生成rss文件

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

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

// 假设我们有一个文章数组
$posts = [
    [
        'title' => 'First Post',
        'link' => 'http://www.example.com/posts/first-post',
        'pubDate' => 'Mon, 01 Jan 2023 00:00:00 GMT'
    ],
    [
        'title' => 'Second Post',
        'link' => 'http://www.example.com/posts/second-post',
        'pubDate' => 'Tue, 02 Jan 2023 00:00:00 GMT'
    ]
];

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

echo '</channel>';
echo '</rss>';
?>