php自动生成rss类文件

<?php
class RSSGenerator {
    private $title;
    private $description;
    private $link;
    private $items = [];

    public function __construct($title, $description, $link) {
        $this->title = $title;
        $this->description = $description;
        $this->link = $link;
    }

    public function addItem($title, $description, $link, $pubDate) {
        $item = [
            'title' => $title,
            'description' => $description,
            'link' => $link,
            'pubDate' => $pubDate
        ];
        $this->items[] = $item;
    }

    public function generate() {
        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>' . htmlspecialchars($this->title) . '</title>';
        echo '<description>' . htmlspecialchars($this->description) . '</description>';
        echo '<link>' . htmlspecialchars($this->link) . '</link>';
        foreach ($this->items as $item) {
            echo '<item>';
            echo '<title>' . htmlspecialchars($item['title']) . '</title>';
            echo '<description>' . htmlspecialchars($item['description']) . '</description>';
            echo '<link>' . htmlspecialchars($item['link']) . '</link>';
            echo '<pubDate>' . htmlspecialchars($item['pubDate']) . '</pubDate>';
            echo '</item>';
        }
        echo '</channel>';
        echo '</rss>';
    }
}

// 示例使用
$generator = new RSSGenerator('My Blog', 'Latest posts from My Blog', 'https://example.com');
$generator->addItem('First Post', 'This is the first post', 'https://example.com/posts/first', 'Mon, 01 Jan 2023 00:00:00 GMT');
$generator->addItem('Second Post', 'This is the second post', 'https://example.com/posts/second', 'Tue, 02 Jan 2023 00:00:00 GMT');
$generator->generate();
?>