public function index(){
        $xml = '<?xml version="1.0" encoding="UTF-8" ?>
<rss version="2.0"
    xmlns:excerpt="http://wordpress.org/export/1.2/excerpt/"
    xmlns:content="http://purl.org/rss/1.0/modules/content/"
    xmlns:wfw="http://wellformedweb.org/CommentAPI/"
    xmlns:dc="http://purl.org/dc/elements/1.1/"
    xmlns:wp="http://wordpress.org/export/1.2/"
>

<channel>
    <title>唯物鹰扬</title>
    <link>http://wordpress.xupengfei.net</link>
    <description>又一个WordPress站点</description>
    <pubDate>Thu, 26 Jul 2018 02:16:53 +0000</pubDate>
    <language>zh-CN</language>
    <wp:wxr_version>1.2</wp:wxr_version>
    <wp:base_site_url>http://wordpress.xupengfei.net</wp:base_site_url>
    <wp:base_blog_url>http://wordpress.xupengfei.net</wp:base_blog_url>

    <wp:author><wp:author_id>1</wp:author_id><wp:author_login><![CDATA[admin]]></wp:author_login><wp:author_email><![CDATA[1121252990@qq.com]]></wp:author_email><wp:author_display_name><![CDATA[admin]]></wp:author_display_name><wp:author_first_name><![CDATA[]]></wp:author_first_name><wp:author_last_name><![CDATA[]]></wp:author_last_name></wp:author>


    <generator>https://wordpress.org/?v=4.9.7</generator>';

        $db = Db::instance('blog');
        $data = $db->select()->from('blog')->query();

        foreach ($data as $k=>$v){
            $xml .= '<item>';
            $xml .= '<title>'.$v['title'].'</title>';
            $xml .= '<link> </link>';
            $xml .= '<pubDate></pubDate>';
            $xml .= '<dc:creator><![CDATA[admin]]></dc:creator>';
            $xml .= '<description></description>';
            $xml .= '<content:encoded><![CDATA['.$v['content'].']]></content:encoded>';
            $xml .= '<excerpt:encoded><![CDATA[]]></excerpt:encoded>';
            $xml .= '<wp:post_id>'.($k+5).'</wp:post_id>';
            $xml .= '<wp:post_date><![CDATA['.date('Y-m-d H:i:s',$v['create_time']).']]></wp:post_date>';
            $xml .= '<wp:post_date_gmt><![CDATA['.date('Y-m-d H:i:s',$v['create_time']).']]></wp:post_date_gmt>';
            $xml .= '<wp:comment_status><![CDATA[open]]></wp:comment_status>';
            $xml .= '<wp:ping_status><![CDATA[open]]></wp:ping_status>';
            $xml .= '<wp:post_name><![CDATA['.$v['title'].']]></wp:post_name>';
            $xml .= '<wp:status><![CDATA[publish]]></wp:status>';
            $xml .= '<wp:post_parent>0</wp:post_parent>';
            $xml .= '<wp:menu_order>0</wp:menu_order>';
            $xml .= '<wp:post_type><![CDATA[post]]></wp:post_type>';
            $xml .= '<wp:post_password><![CDATA[]]></wp:post_password>';
            $xml .= '<wp:is_sticky>0</wp:is_sticky>';
            $xml .= '<category domain="category" nicename="uncategorized"><![CDATA[未分类]]></category>';
            $xml .= '<wp:postmeta>';
            $xml .= '<wp:meta_key><![CDATA[post_views_count]]></wp:meta_key>';
            $xml .= '<wp:meta_value><![CDATA['.$v['onclicks'].']]></wp:meta_value>';
            $xml .= '</wp:postmeta>';
            $xml .= '</item>';
        }

        $xml .= '</channel>
</rss>';
        Http::header('Content-type: text/xml');
        return $this->send($xml);
    }