我试图循环思考一个自定义帖子类型（艺术家），然后是每个类别，然后是另一个与艺术家有关系的自定义帖子类型（故事）。
问题是，函数ID）；？>在最后一个循环中，将多次返回艺术家的标题以及当前自定义帖子的标题。我只需要当前循环帖子的标题。
<!-- get all the artists -->
<?php
$args = array(\'post_type\' => \'artists\');
$query = new WP_QUERY( $args );
?>
<?php if( $query->have_posts() ) : while( $query->have_posts() ) : $query->the_post(); ?>
<h1><?php the_title(); ?></h1>
<p><?php the_field(\'artist_website\'); ?></p>
<!-- looping through all the categories -->
<?php
$cats = get_categories();
// loop through the categries
foreach ($cats as $cat) {
// setup the cateogory ID
$cat_id= $cat->term_id;
// Make a header for the cateogry
echo "<h2>".$cat->name."</h2>";
?>
<!-- looping through the stories that have a relationship with the artist (select_artist) -->
<?php
$post_type = \'story\';
$args = array(
\'post_type\' => $post_type,
\'posts_per_page\' => -1, //show all posts
\'tax_query\' => array(
array(
\'taxonomy\' => \'category\',
\'field\' => \'slug\',
\'terms\' => $cat->slug,
)
),
\'meta_query\' => array(
array(
\'key\' => \'select_artist\', // name of custom field
\'value\' => \'"\' . get_the_ID() . \'"\', // matches exaclty "123", not just 123.
\'compare\' => \'LIKE\'
)
)
);
$stories = new WP_Query($args);
?>
<?php if( $stories ): ?>
<ul>
<?php foreach( $stories as $story ): ?>
<!-- Problem echo below -->
<?php echo get_the_title( $story->ID ); ?>
<?php endforeach; ?>
</ul>
<?php endif; ?>
<?php } // done the foreach statement ?>
<?php endwhile; wp_reset_postdata(); endif; ?>
**EDIT** var dump of $stories
object(WP_Query)#307 (46) { ["query"]=> array(4) { ["post_type"]=> string(5) "story" ["posts_per_page"]=> int(-1) ["tax_query"]=> array(1) { [0]=> array(3) { ["taxonomy"]=> string(8) "category" ["field"]=> string(4) "slug" ["terms"]=> string(12) "category-one" } } ["meta_query"]=> array(1) { [0]=> array(3) { ["key"]=> string(13) "select_artist" ["value"]=> string(5) ""104"" ["compare"]=> string(4) "LIKE" } } } ["query_vars"]=> array(63) { ["post_type"]=> string(5) "story" ["posts_per_page"]=> int(-1) ["tax_query"]=> array(1) { [0]=> array(3) { ["taxonomy"]=> string(8) "category" ["field"]=> string(4) "slug" ["terms"]=> string(12) "category-one" } } ["meta_query"]=> array(1) { [0]=> array(3) { ["key"]=> string(13) "select_artist" ["value"]=> string(5) ""104"" ["compare"]=> string(4) "LIKE" } } ["error"]=> string(0) "" ["m"]=> string(0) "" ["p"]=> int(0) ["post_parent"]=> string(0) "" ["subpost"]=> string(0) "" ["subpost_id"]=> string(0) "" ["attachment"]=> string(0) "" ["attachment_id"]=> int(0) ["name"]=> string(0) "" ["static"]=> string(0) "" ["pagename"]=> string(0) "" ["page_id"]=> int(0) ["second"]=> string(0) "" ["minute"]=> string(0) "" ["hour"]=> string(0) "" ["day"]=> int(0) ["monthnum"]=> int(0) ["year"]=> int(0) ["w"]=> int(0) ["category_name"]=> string(12) "category-one" ["tag"]=> string(0) "" ["cat"]=> int(6) ["tag_id"]=> string(0) "" ["author"]=> string(0) "" ["author_name"]=> string(0) "" ["feed"]=> string(0) "" ["tb"]=> string(0) "" ["paged"]=> int(0) ["comments_popup"]=> string(0) "" ["meta_key"]=> string(0) "" ["meta_value"]=> string(0) "" ["preview"]=> string(0) "" ["s"]=> string(0) "" ["sentence"]=> string(0) "" ["fields"]=> string(0) "" ["menu_order"]=> string(0) "" ["category__in"]=> array(0) { } ["category__not_in"]=> array(0) { } ["category__and"]=> array(0) { } ["post__in"]=> array(0) { } ["post__not_in"]=> array(0) { } ["tag__in"]=> array(0) { } ["tag__not_in"]=> array(0) { } ["tag__and"]=> array(0) { } ["tag_slug__in"]=> array(0) { } ["tag_slug__and"]=> array(0) { } ["post_parent__in"]=> array(0) { } ["post_parent__not_in"]=> array(0) { } ["author__in"]=> array(0) { } ["author__not_in"]=> array(0) { } ["ignore_sticky_posts"]=> bool(false) ["suppress_filters"]=> bool(false) ["cache_results"]=> bool(true) ["update_post_term_cache"]=> bool(true) ["update_post_meta_cache"]=> bool(true) ["nopaging"]=> bool(true) ["comments_per_page"]=> string(2) "50" ["no_found_rows"]=> bool(false) ["order"]=> string(4) "DESC" } ["tax_query"]=> object(WP_Tax_Query)#304 (6) { ["queries"]=> array(1) { [0]=> array(5) { ["taxonomy"]=> string(8) "category" ["terms"]=> array(1) { [0]=> string(12) "category-one" } ["field"]=> string(4) "slug" ["operator"]=> string(2) "IN" ["include_children"]=> bool(true) } } ["relation"]=> string(3) "AND" ["table_aliases":protected]=> array(1) { [0]=> string(21) "wp_term_relationships" } ["queried_terms"]=> array(1) { ["category"]=> array(2) { ["terms"]=> array(1) { [0]=> string(12) "category-one" } ["field"]=> string(4) "slug" } } ["primary_table"]=> string(8) "wp_posts" ["primary_id_column"]=> string(2) "ID" } ["meta_query"]=> object(WP_Meta_Query)#305 (7) { ["queries"]=> array(2) { [0]=> array(3) { ["key"]=> string(13) "select_artist" ["value"]=> string(5) ""104"" ["compare"]=> string(4) "LIKE" } ["relation"]=> string(2) "OR" } ["relation"]=> string(3) "AND" ["meta_table"]=> string(11) "wp_postmeta" ["meta_id_column"]=> string(7) "post_id" ["primary_table"]=> string(8) "wp_posts" ["primary_id_column"]=> string(2) "ID" ["table_aliases":protected]=> array(1) { [0]=> string(11) "wp_postmeta" } } ["date_query"]=> bool(false) ["request"]=> string(525) "SELECT wp_posts.* 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 (6) ) AND wp_posts.post_type = \'story\' AND (wp_posts.post_status = \'publish\' OR wp_posts.post_status = \'private\') AND ( ( wp_postmeta.meta_key = \'select_artist\' AND CAST(wp_postmeta.meta_value AS CHAR) LIKE \'%\\"104\\"%\' ) ) GROUP BY wp_posts.ID ORDER BY wp_posts.post_date DESC " ["posts"]=> array(0) { } ["post_count"]=> int(0) ["current_post"]=> int(-1) ["in_the_loop"]=> bool(false) ["comment_count"]=> int(0) ["current_comment"]=> int(-1) ["found_posts"]=> int(0) ["max_num_pages"]=> int(0) ["max_num_comment_pages"]=> int(0) ["is_single"]=> bool(false) ["is_preview"]=> bool(false) ["is_page"]=> bool(false) ["is_archive"]=> bool(true) ["is_date"]=> bool(false) ["is_year"]=> bool(false) ["is_month"]=> bool(false) ["is_day"]=> bool(false) ["is_time"]=> bool(false) ["is_author"]=> bool(false) ["is_category"]=> bool(true) ["is_tag"]=> bool(false) ["is_tax"]=> bool(false) ["is_search"]=> bool(false) ["is_feed"]=> bool(false) ["is_comment_feed"]=> bool(false) ["is_trackback"]=> bool(false) ["is_home"]=> bool(false) ["is_404"]=> bool(false) ["is_comments_popup"]=> bool(false) ["is_paged"]=> bool(false) ["is_admin"]=> bool(false) ["is_attachment"]=> bool(false) ["is_singular"]=> bool(false) ["is_robots"]=> bool(false) ["is_posts_page"]=> bool(false) ["is_post_type_archive"]=> bool(false) ["query_vars_hash":"WP_Query":private]=> string(32) "6db7f7961e185d6e6411219e7317dd72" ["query_vars_changed":"WP_Query":private]=> bool(false) ["thumbnails_cached"]=> bool(false) ["stopwords":"WP_Query":private]=> NULL }
最合适的回答,由SO网友:DACrosby 整理而成
我认为，问题是if ($stories) 总是返回true，即使没有帖子。然后，它将遍历WP查询元素，而不是实际的帖子。请尝试以下操作：
if ( $stories->have_posts() ) {
while ( $stories->have_posts() ) : $stories->the_post();
echo get_the_title( get_the_ID() );
endwhile; $query->reset_postdata();
}
