我正在为WooCommerce编写一个插件。在我的插件中的某个地方，我检查一个查询是否有post，但总是这样myWPQUERYobject->have_posts() 返回false！这里是var_dump 对象的：

object(WP_Query)#17793 (48) { ["query"]=> array(8) { ["post_type"]=> string(10) "shop_order" ["post__in"]=> array(21) { [0]=> string(5) "12501" [1]=> string(5) "12502" [2]=> string(5) "12503" [3]=> string(5) "12506" [4]=> string(5) "12510" [5]=> string(5) "12513" [6]=> string(5) "12528" [7]=> string(5) "12529" [8]=> string(5) "12536" [9]=> string(5) "12557" [10]=> string(5) "12558" [11]=> string(5) "12561" [12]=> string(5) "12565" [13]=> string(5) "12575" [14]=> string(5) "12576" [15]=> string(5) "12578" [16]=> string(5) "12587" [17]=> string(5) "12601" [18]=> string(5) "12602" [19]=> string(5) "12603" [20]=> string(5) "12604" } ["post_status"]=> string(7) "publish" ["posts_per_page"]=> int(20) ["order"]=> string(4) "DESC" ["meta_key"]=> string(14) "_customer_user" ["meta_value"]=> int(10) ["tax_query"]=> array(1) { [0]=> array(3) { ["taxonomy"]=> string(17) "shop_order_status" ["field"]=> string(4) "slug" ["terms"]=> array(1) { [0]=> string(9) "Completed" } } } } ["query_vars"]=> array(66) { ["post_type"]=> string(10) "shop_order" ["post__in"]=> array(21) { [0]=> string(5) "12501" [1]=> string(5) "12502" [2]=> string(5) "12503" [3]=> string(5) "12506" [4]=> string(5) "12510" [5]=> string(5) "12513" [6]=> string(5) "12528" [7]=> string(5) "12529" [8]=> string(5) "12536" [9]=> string(5) "12557" [10]=> string(5) "12558" [11]=> string(5) "12561" [12]=> string(5) "12565" [13]=> string(5) "12575" [14]=> string(5) "12576" [15]=> string(5) "12578" [16]=> string(5) "12587" [17]=> string(5) "12601" [18]=> string(5) "12602" [19]=> string(5) "12603" [20]=> string(5) "12604" } ["post_status"]=> string(12) "wc-Completed" ["posts_per_page"]=> int(20) ["order"]=> string(4) "DESC" ["meta_key"]=> string(14) "_customer_user" ["meta_value"]=> int(10) ["tax_query"]=> array(0) { } ["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(0) "" ["tag"]=> string(0) "" ["cat"]=> string(0) "" ["tag_id"]=> string(0) "" ["author"]=> string(0) "" ["author_name"]=> string(0) "" ["feed"]=> string(0) "" ["tb"]=> string(0) "" ["paged"]=> int(0) ["preview"]=> string(0) "" ["s"]=> string(0) "" ["sentence"]=> string(0) "" ["title"]=> string(0) "" ["fields"]=> string(0) "" ["menu_order"]=> string(0) "" ["embed"]=> string(0) "" ["category__in"]=> array(0) { } ["category__not_in"]=> array(0) { } ["category__and"]=> array(0) { } ["post__not_in"]=> array(0) { } ["post_name__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) ["lazy_load_term_meta"]=> bool(true) ["update_post_meta_cache"]=> bool(true) ["nopaging"]=> bool(false) ["comments_per_page"]=> string(2) "50" ["no_found_rows"]=> bool(false) } ["tax_query"]=> object(WP_Tax_Query)#17790 (6) { ["queries"]=> array(0) { } ["relation"]=> string(3) "AND" ["table_aliases":protected]=> array(0) { } ["queried_terms"]=> array(0) { } ["primary_table"]=> string(11) "mdvat_posts" ["primary_id_column"]=> string(2) "ID" } ["meta_query"]=> object(WP_Meta_Query)#17791 (9) { ["queries"]=> array(2) { [0]=> array(2) { ["key"]=> string(14) "_customer_user" ["value"]=> int(10) } ["relation"]=> string(2) "OR" } ["relation"]=> string(3) "AND" ["meta_table"]=> string(14) "mdvat_postmeta" ["meta_id_column"]=> string(7) "post_id" ["primary_table"]=> string(11) "mdvat_posts" ["primary_id_column"]=> string(2) "ID" ["table_aliases":protected]=> array(1) { [0]=> string(14) "mdvat_postmeta" } ["clauses":protected]=> array(1) { ["mdvat_postmeta"]=> array(5) { ["key"]=> string(14) "_customer_user" ["value"]=> int(10) ["compare"]=> string(1) "=" ["alias"]=> string(14) "mdvat_postmeta" ["cast"]=> string(4) "CHAR" } } ["has_or_relation":protected]=> bool(false) } ["date_query"]=> bool(false) ["request"]=> string(502) "SELECT SQL_CALC_FOUND_ROWS mdvat_posts.ID FROM mdvat_posts INNER JOIN mdvat_postmeta ON ( mdvat_posts.ID = mdvat_postmeta.post_id ) WHERE 1=1 AND mdvat_posts.ID IN (12501,12502,12503,12506,12510,12513,12528,12529,12536,12557,12558,12561,12565,12575,12576,12578,12587,12601,12602,12603,12604) AND ( ( mdvat_postmeta.meta_key = \'_customer_user\' AND mdvat_postmeta.meta_value = \'10\' ) ) AND mdvat_posts.post_type = \'shop_order\' GROUP BY mdvat_posts.ID ORDER BY mdvat_posts.post_date DESC LIMIT 0, 20" ["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(false) ["is_tag"]=> bool(false) ["is_tax"]=> bool(true) ["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_embed"]=> bool(false) ["is_paged"]=> bool(false) ["is_admin"]=> bool(true) ["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) "c6d527f823896b8b9484557b2d167ae6" ["query_vars_changed":"WP_Query":private]=> bool(true) ["thumbnails_cached"]=> bool(false) ["stopwords":"WP_Query":private]=> NULL ["compat_fields":"WP_Query":private]=> array(2) { [0]=> string(15) "query_vars_hash" [1]=> string(18) "query_vars_changed" } ["compat_methods":"WP_Query":private]=> array(2) { [0]=> string(16) "init_query_flags" [1]=> string(15) "parse_tax_query" } }