WordPress如何调用全站随机文章/同分类随机文章

//numberposts 为文章数量

$args = array( 'numberposts' => 5, 'orderby' => 'rand', 'post_status' => 'publish' );
$rand_posts = get_posts( $args );
foreach( $rand_posts as $post ) : ?>

a href="the_permalink(); ?>" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow" >the_title(); ?>a>

endforeach; ?>

$cat = get_the_category();
foreach($cat as $key=>$category){
$catid = $category->term_id;}
$args = array('orderby' => 'rand','showposts' => 8,'cat' => $catid ); // 显示文章篇数
$query_posts = new WP_Query();
$query_posts->query($args);
while ($query_posts->have_posts()) : $query_posts->the_post();?>

a href="the_permalink(); ?>" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow" >the_title(); ?>a>

endwhile;?>
wp_reset_query(); ?>