Question

我有这段代码：

$categories = get_query_var('cat');  //now: $categories = "201";
$categories .= ",";  //now: $categories = "201,";
$sub_cats = get_categories('parent='.$categories); //grab subcategories of this main category
foreach($sub_cats as $sub_cat){ //grab term id of subcategories
$categories .= $sub_cat->term_id;
$categories .= ",";
}
//now $categories = "201,119,394,";
$categories = substr($categories, 0, -1); //now $categories = "201,119,394";


query_posts( array( 'category__in' => array( $categories ), 'meta_key' => '_single_views', 'orderby' => 'meta_value_num', 'order' => 'DESC' , 'paged' => $paged ));

问题是它只返回201类中的帖子（所有时间只是$ category变量的第一类）。

数据库查询是：

SELECT SQL_CALC_FOUND_ROWS  wp_posts.ID FROM wp_posts  INNER JOIN wp_term_relationships ON (wp_posts.ID = wp_term_relationships.object_id) INNER JOIN wp_postmeta ON ( wp_posts.ID = wp_postmeta.post_id ) WHERE 1=1  AND ( 
  wp_term_relationships.term_taxonomy_id IN (201)
) AND wp_posts.post_type = 'post' AND (wp_posts.post_status = 'publish' OR wp_posts.post_status = 'private') AND ( 
  wp_postmeta.meta_key = '_single_views'
) GROUP BY wp_posts.ID ORDER BY wp_postmeta.meta_value+0 DESC LIMIT 0, 20

请问哪里有问题？我需要返回类别201,119,394中的所有帖子（至少在其中一个帖子中的帖子）。谢谢你的帮助。

Answer 1

这很好用。

query_posts( array( 'cat' => $categories, 'meta_key' => '_single_views', 'orderby' => 'meta_value_num', 'order' => 'DESC' , 'paged' => $paged ));

Answer 2

好的，建议：要么颠倒两行：

$categories .= ",";  //now: $categories = "201,";
$sub_cats = get_categories('parent='.$categories);

原因：类别（201）变为201，然后在parent = $ categories中使用。由于。

，因此无法返回任何内容

或使用此替代方法：

$categories = get_query_var('cat');  //now: $categories = "201";
$sub_cats = get_categories('parent='.$categories); //grab subcategories of this main category
foreach($sub_cats as $sub_cat){ //grab term id of subcategories
$categories .= ",".$sub_cat->term_id;
}
query_posts( array( 'category__in' => array( $categories ), 'meta_key' => '_single_views', 'orderby' => 'meta_value_num', 'order' => 'DESC' , 'paged' => $paged ));

P.S。类别_是否正确？连续两次下划线可能会带来更多麻烦。

Wordpress查询：category__in只接受第一个参数，而不是更多

2 个答案: