wordpress非插件实现xml格式网站地图

<?php
require('./wp-blog-header.php');
header("Content-type: text/xml");
header('HTTP/1.1 200 OK');
$posts_to_show = 1000; // 获取文章数量
echo '<?xml version="1.0" encoding="UTF-8"?>';
echo '<urlset xmlns:xsi="<a href="http://www.w3.org/2001/XMLSchema-instance" rel="external nofollow" >http://www.w3.org/2001/XMLSchema-instance</a>" xmlns="<a href="http://www.sitemaps.org/schemas/sitemap/0.9" rel="external nofollow" rel="external nofollow" >http://www.sitemaps.org/schemas/sitemap/0.9</a>"
xsi:schemaLocation="<a href="http://www.sitemaps.org/schemas/sitemap/0.9" rel="external nofollow" rel="external nofollow" >http://www.sitemaps.org/schemas/sitemap/0.9</a> <a href="http://www.sitemaps.org/schemas/sitemap/0.9/sitemap.xsd">'" rel="external nofollow" >http://www.sitemaps.org/schemas/sitemap/0.9/sitemap.xsd">'</a>;
?>
<!-- generated-on=<?php echo get_lastpostdate('blog'); ?>-->
<url>
<loc>http://localhost/</loc>
<lastmod><?php echo get_lastpostdate('blog'); ?></lastmod>
<changefreq>daily</changefreq>
<priority>1.0</priority>
</url>
<?php
header("Content-type: text/xml");
$myposts = get_posts( "numberposts=" . $posts_to_show );
foreach( $myposts as $post ) { ?>
<url>
<loc><?php the_permalink(); ?></loc>
<lastmod><?php the_time('c') ?></lastmod>
<changefreq>monthly</changefreq>
<priority>0.6</priority>
</url>
<?php } // end foreach ?>
</urlset>