WordPress 怎么调用网站所有tag标签及文章列表
WordPress 怎么调用网站所有tag标签一般有二种方法，第一种是使用WORDPRESS提供的标签直接调用。
<?php wp_tag_cloud('smallest=12&largest=18&unit=px&number=0&number=30&orderby=count&order=DESC');?>
上面这种可以直接调用出网站中所有的tag标签，但是样式比较单调，比较难控制它的样式。如果想更灵活的调用tag标签，可以使用以下的代码：
<?php
$tags = get_tags( array( 'orderby' => 'count', 'order' => 'DESC', 'number' => '30') );
foreach ( $tags as $tag ) {
$tag_link = get_tag_link( $tag->term_id );
echo '<li><a href="'.$tag_link.'">'.$tag->name.'</a></li>';
}
?>
排序预设是以名称(name)做排序，若是自己写函数取标签清单，我们有两个栏位可以做排序，一是count、二是term_id。orderby的后面若是留空，则对term_id 排序。
也可以获取当前分类下的所有TAG标签
第一步：在主题文件function.php文件中添加：
function get_category_tags($args) {
global $wpdb;
$tags = $wpdb->get_results
("
SELECT DISTINCT terms2.term_id as tag_id, terms2.name as tag_name
FROM
$wpdb->posts as p1
LEFT JOIN $wpdb->term_relationships as r1 ON p1.ID = r1.object_ID
LEFT JOIN $wpdb->term_taxonomy as t1 ON r1.term_taxonomy_id = t1.term_taxonomy_id
LEFT JOIN $wpdb->terms as terms1 ON t1.term_id = terms1.term_id,
$wpdb->posts as p2
LEFT JOIN $wpdb->term_relationships as r2 ON p2.ID = r2.object_ID
LEFT JOIN $wpdb->term_taxonomy as t2 ON r2.term_taxonomy_id = t2.term_taxonomy_id
LEFT JOIN $wpdb->terms as terms2 ON t2.term_id = terms2.term_id
WHERE
t1.taxonomy = 'category' AND p1.post_status = 'publish' AND terms1.term_id IN (".
$args['categories'].") AND
t2.taxonomy = 'post_tag' AND p2.post_status = 'publish'
AND p1.ID = p2.ID
ORDER by tag_name
");
$count = 0;
if($tags) {
foreach ($tags as $tag) {
$mytag[$count] = get_term_by('id', $tag->tag_id, 'post_tag');
$count++;
}
} else {
$mytag = NULL;
}
return $mytag;
}
第二步：在主题的分类页添加如下代码：
<?php
$cid = get_query_var('cat'); //当前分类id
$top_id = get_category_root_id($cat); //顶级分类
if($cid == $top_id){
//如果是顶级分类
$typeid = get_category_root_id($cat);
$terms = get_terms(array('taxonomy' => 'category','parent' => $typeid ));
$tags = array();
foreach($terms as $term) {
$id = $term->term_id;
$arg = array( 'categories' => $id);
$a = get_category_tags($arg);
$tags = array_merge((array)$tags,(array)$a);
}
}else{
//如果是子分类
$id = get_query_var('cat');
$args = array( 'categories' => $id);
$tags = get_category_tags($args);
}
if(!empty($tags)){ //如果标签数组不为空
$key = array_column($tags,'count'); //排序：获取数组中的count
array_multisort($key,SORT_DESC,$tags); //排序：对数组进行排序
$i=1;
foreach($tags as $tag){ if($i>=35) break; $i++; //35为循环个数 ?>
<li><a href="<?php echo get_tag_link($tag->term_id); ?>"> <?php echo $tag->name; ?></a></li>
<? } } ?>
<? echo $kwords; ?>
我们可以通过TAG标签的ID来获取这个标签下的所有文章。
<?php
$tag = $tag->term_id; //标签名/ID
$args=array(
'tag' => $tag->term_id,
'showposts'=>5, //输出的文章数量
'caller_get_posts'=>1
);
$my_query = new WP_Query($args);
if( $my_query->have_posts() ) {
while ($my_query->have_posts()) : $my_query->the_post(); ?>
<a href="<?php the_permalink() ?>" ><?php the_title(); ?></a>
<?php
endwhile;
}
wp_reset_query();
?>
还可以直接从数据库中读取所有的TAG标签。
<?php
$varstag = $wpdb -> get_results("SELECT * FROM `wp_term_taxonomy` where taxonomy='post_tag' LIMIT 4000", ARRAY_A);
foreach($varstag as $var){
?>
<a href="<?php echo get_tag_link($var['term_id']); ?>" target="_blank"><?php $tagnqme = get_tag($var['term_id']);echo $tagnqme->name;?></a>
<?php }?>
