我有以下代码：
$data = new WP_Query('s=a');
并且 print_r 返回以下数据：
WP_Query Object
(
[query_vars] => Array
(
[s] => a
[error] =>
[m] => 0
[p] => 0
[post_parent] =>
[subpost] =>
[subpost_id] =>
[attachment] =>
[attachment_id] => 0
[name] =>
[static] =>
[pagename] =>
[page_id] => 0
[second] =>
[minute] =>
[hour] =>
[day] => 0
[monthnum] => 0
[year] => 0
[w] => 0
[category_name] =>
[tag] =>
[cat] =>
[tag_id] =>
[author_name] =>
[feed] =>
[tb] =>
[paged] => 0
[comments_popup] =>
[meta_key] =>
[meta_value] =>
[preview] =>
[sentence] =>
[fields] =>
[menu_order] =>
[category__in] => Array
(
)
[category__not_in] => Array
(
)
[category__and] => Array
(
)
[post__in] => Array
(
)
[post__not_in] => Array
(
)
[tag__in] => Array
(
)
[tag__not_in] => Array
(
)
[tag__and] => Array
(
)
[tag_slug__in] => Array
(
)
[tag_slug__and] => Array
(
)
[ignore_sticky_posts] =>
[suppress_filters] =>
[cache_results] => 1
[update_post_term_cache] => 1
[update_post_meta_cache] => 1
[post_type] => any
[posts_per_page] => 10
[nopaging] =>
[comments_per_page] => 50
[no_found_rows] =>
[search_terms] => Array
(
[0] => a
)
[order] => DESC
)
[tax_query] => WP_Tax_Query Object
(
[queries] => Array
(
)
[relation] => AND
)
[meta_query] => WP_Meta_Query Object
(
[queries] => Array
(
)
[relation] =>
)
[post_count] => 0
[current_post] => -1
[in_the_loop] =>
[comment_count] => 0
[current_comment] => -1
[found_posts] => 0
[max_num_pages] => 0
[max_num_comment_pages] => 0
[is_single] =>
[is_preview] =>
[is_page] =>
[is_archive] =>
[is_date] =>
[is_year] =>
[is_month] =>
[is_day] =>
[is_time] =>
[is_author] =>
[is_category] =>
[is_tag] =>
[is_tax] =>
[is_search] => 1
[is_feed] =>
[is_comment_feed] =>
[is_trackback] =>
[is_home] =>
[is_404] =>
[is_comments_popup] =>
[is_paged] =>
[is_admin] =>
[is_attachment] =>
[is_singular] =>
[is_robots] =>
[is_posts_page] =>
[is_post_type_archive] =>
[query_vars_hash] => 1015947de489d0153582586bded7c016
[query_vars_changed] =>
[thumbnails_cached] =>
[query] => Array
(
[s] => a
)
[request] => SELECT * FROM wp_posts WHERE 1=2
[posts] => Array
(
)
)
这个查询有什么问题并且不返回任何数据？还要看一下“requer”，它是“SELECT * FROM wp_posts WHERE 1=2”