wordpress站点地图(sitemap)纯代码无需插件自动生成

// 判断定时计划是否存在
if ( ! wp_next_scheduled( 'sitemap_xml' ) ) {
wp_schedule_event( time(), 'twicedaily', 'sitemap_xml' ); // 每天两次
}
add_action( 'sitemap_xml', 'sitemap_xml_func' );

// 定时计划执行函数
function sitemap_xml_func() {
// 获取文章数量
$count_posts = wp_count_posts();
if ( $count_posts ) {
$published_posts = $count_posts->publish;
$sitemap_num = $published_posts / 5000; // 每个xml文件最多包含5000篇文章
$sitemap_num = ceil($sitemap_num);

// 创建xml文件
for ($i = 1; $i <= $sitemap_num; $i++) {
$postsForSitemap = get_posts(array(
'numberposts' => 3000,
'orderby' => 'modified',
'post_type' => array('post'),
'order' => 'DESC',
'offset' => 3000 * ($i - 1)
));
$sitemap = '<?xml version="1.0" encoding="UTF-8"?>';
$sitemap .= '<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">';
foreach($postsForSitemap as $post) {
setup_postdata($post);
$post_url = get_permalink($post->ID);
$post_date = get_the_modified_date( 'c',$post->ID );

$sitemap .= '<url>'.
'<loc>'. $post_url .'</loc>'.
'<lastmod>'. $post_date .'</lastmod>'.
// '<lastmod>'. $postdate[0] .'</lastmod>'.
// '<changefreq>monthly</changefreq>'.
'</url>';
}
$sitemap .= '</urlset>';
$fp = fopen(ABSPATH . "sitemap-".$i.".xml", 'w');
fwrite($fp, $sitemap);
fclose($fp);
}

// 创建sitemap.xml文件
$sitemap_all = '<?xml version="1.0" encoding="UTF-8"?>';
$sitemap_all .= '<sitemapindex xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">';
for ($i = 1; $i <= $sitemap_num; $i++) {
$sitemap_all .= '<sitemap>'.
'<loc>'. get_bloginfo('url') .'/sitemap-'.$i.'.xml</loc>'.
'<lastmod>'. date('c') .'</lastmod>'.
'</sitemap>';
}
$sitemap_all .= '</sitemapindex>';
$fp = fopen(ABSPATH . "sitemap.xml", 'w');
fwrite($fp, $sitemap_all);
fclose($fp);
}
}