即使没有结果返回，查询计数也将返回1

Question

I' am working with WordPress. When I do a normal query everything works great, but when I want to test if theirs no results it should show up something like

"Sorry, but nothing matched your search criteria. Please try again with some different keywords."

This was looking strange to me because even though the query doesn't have any results it still showing as $count 1 whereas it should showup as $count 0. Here is the Code in placed.

URL Variables

    $get_search = trim($get_search);
    $get_from = trim($get_from);
    $get_to = trim($get_to);
    $get_districts = trim($get_districts);
    $get_string = trim($get_string);

        if($get_search == "Submit"){

        }
}
?>

This is actually code

<?php
// Get districts from database plugin
    $districts = get_district();
    $options="";
        foreach($districts[0]['choices'] as $key => $val){
            if($key == $get_districts){
                $options .= "<option value='".$key."' selected>".$val."</option>";
            } else {
                $options .= "<option value='".$key."'>".$val."</option>";
            }
        }
?>
    <form method="get" action="<?php echo site_url();?>/planned-outages/" enctype="multipart/form-data">
        From Date : <input type="text" name="from" class="from" value="<?php echo $get_from; ?>"/>
        To Date : <input type="text" name="to" class="to" value="<?php echo $get_to; ?>"/>
        District: <select name="districts"><?php echo $options; ?></select>
        Search for : <input type="text" name="string" value="<?php echo $get_string; ?>"/>
        <input name="search" type="submit"/>
    </form>
<?php                   
    global $post;
    $args = array(
        'order' => 'DESC',
        'orderby' => 'post_date',
        'post_status' => 'publish',
        'post_type' => 'outages',
        's' => $get_string,
            'meta_query' => array(
                'relation' => 'OR',
                   array(
                       'key' => 'district',
                       'value' => $get_districts,
                       'compare' => 'LIKE'
                   ),
                   array(
                       'key' => 'from_date_time',
                       'value' => $get_from,
                       'compare' => 'LIKE'
                   ),
                   array(
                       'key' => 'to_date_time',
                       'value' => $get_to,
                       'compare' => 'LIKE'
                   )
            )
    );
?>  
<?php
    $list_of_posts = new WP_Query($args);
    $count = count($list_of_posts);

    if($count > 0){
        while ($list_of_posts->have_posts()):$list_of_posts->the_post();
        $meta = get_post_meta( get_the_ID(), '');
    ?>
        <?php the_title(); ?>
        <?php the_content(); ?>
    <?php
        endwhile; 
    } else {
    ?>
        Sorry, but nothing matched your search criteria. Please try again with some different keywords.
    <?php
    }
    ?>

When I var_dump($list_of_posts) $list_of_posts this is what I get

object(WP_Query)#443 (46) { ["query"]=> array(6) { ["order"]=> string(4) "DESC" ["orderby"]=> string(9) "post_date" ["post_status"]=> string(7) "publish" ["post_type"]=> string(7) "outages" ["s"]=> string(5) "links" ["meta_query"]=> array(4) { ["relation"]=> string(2) "OR" [0]=> array(3) { ["key"]=> string(8) "district" ["value"]=> string(8) "rakiraki" ["compare"]=> string(4) "LIKE" } [1]=> array(3) { ["key"]=> string(14) "from_date_time" ["value"]=> string(10) "12/26/2013" ["compare"]=> string(4) "LIKE" } [2]=> array(3) { ["key"]=> string(12) "to_date_time" ["value"]=> string(0) "" ["compare"]=> string(4) "LIKE" } } } ["query_vars"]=> array(67) { ["order"]=> string(4) "DESC" ["orderby"]=> string(9) "post_date" ["post_status"]=> string(7) "publish" ["post_type"]=> string(7) "outages" ["s"]=> string(5) "links" ["meta_query"]=> array(4) { ["relation"]=> string(2) "OR" [0]=> array(3) { ["key"]=> string(8) "district" ["value"]=> string(8) "rakiraki" ["compare"]=> string(4) "LIKE" } [1]=> array(3) { ["key"]=> string(14) "from_date_time" ["value"]=> string(10) "12/26/2013" ["compare"]=> string(4) "LIKE" } [2]=> array(3) { ["key"]=> string(12) "to_date_time" ["value"]=> string(0) "" ["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(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) ["comments_popup"]=> string(0) "" ["meta_key"]=> string(0) "" ["meta_value"]=> string(0) "" ["preview"]=> 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) ["posts_per_page"]=> int(10) ["nopaging"]=> bool(false) ["comments_per_page"]=> string(2) "50" ["no_found_rows"]=> bool(false) ["search_terms_count"]=> int(1) ["search_terms"]=> array(1) { [0]=> string(5) "links" } ["search_orderby_title"]=> array(1) { [0]=> string(35) "fea_posts.post_title LIKE '%links%'" } } ["tax_query"]=> object(WP_Tax_Query)#446 (2) { ["queries"]=> array(0) { } ["relation"]=> string(3) "AND" } ["meta_query"]=> object(WP_Meta_Query)#445 (2) { ["queries"]=> array(3) { [0]=> array(3) { ["key"]=> string(8) "district" ["value"]=> string(8) "rakiraki" ["compare"]=> string(4) "LIKE" } [1]=> array(3) { ["key"]=> string(14) "from_date_time" ["value"]=> string(10) "12/26/2013" ["compare"]=> string(4) "LIKE" } [2]=> array(3) { ["key"]=> string(12) "to_date_time" ["value"]=> string(0) "" ["compare"]=> string(4) "LIKE" } } ["relation"]=> string(2) "OR" } ["date_query"]=> bool(false) ["request"]=> string(767) "SELECT SQL_CALC_FOUND_ROWS fea_posts.ID FROM fea_posts INNER JOIN fea_postmeta ON (fea_posts.ID = fea_postmeta.post_id) INNER JOIN fea_postmeta AS mt1 ON (fea_posts.ID = mt1.post_id) INNER JOIN fea_postmeta AS mt2 ON (fea_posts.ID = mt2.post_id) WHERE 1=1 AND (((fea_posts.post_title LIKE '%links%') OR (fea_posts.post_content LIKE '%links%'))) AND fea_posts.post_type = 'outages' AND (fea_posts.post_status = 'publish') AND ( (fea_postmeta.meta_key = 'district' AND CAST(fea_postmeta.meta_value AS CHAR) LIKE '%rakiraki%') OR (mt1.meta_key = 'from_date_time' AND CAST(mt1.meta_value AS CHAR) LIKE '%12/26/2013%') OR (mt2.meta_key = 'to_date_time' AND CAST(mt2.meta_value AS CHAR) LIKE '%%') ) GROUP BY fea_posts.ID ORDER BY fea_posts.post_date DESC LIMIT 0, 10" ["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(false) ["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(false) ["is_search"]=> bool(true) ["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"]=> string(32) "53d948b3d27e923c345546711f9b2d03" ["query_vars_changed"]=> bool(false) ["thumbnails_cached"]=> bool(false) ["stopwords":"WP_Query":private]=> array(29) { [0]=> string(5) "about" [1]=> string(2) "an" [2]=> string(3) "are" [3]=> string(2) "as" [4]=> string(2) "at" [5]=> string(2) "be" [6]=> string(2) "by" [7]=> string(3) "com" [8]=> string(3) "for" [9]=> string(4) "from" [10]=> string(3) "how" [11]=> string(2) "in" [12]=> string(2) "is" [13]=> string(2) "it" [14]=> string(2) "of" [15]=> string(2) "on" [16]=> string(2) "or" [17]=> string(4) "that" [18]=> string(3) "the" [19]=> string(4) "this" [20]=> string(2) "to" [21]=> string(3) "was" [22]=> string(4) "what" [23]=> string(4) "when" [24]=> string(5) "where" [25]=> string(3) "who" [26]=> string(4) "will" [27]=> string(4) "with" [28]=> string(3) "www" } }

Answer 1

new WP_Query($args) is just an Object, now an array, so count(object) will always 1.

Just quote from the WP document:

$the_query = new WP_Query ( $args );

// The Loop
if ($the_query->have_posts ())
{
    .....
}
else
{
    // no posts found
}

http://codex.wordpress.org/Class_Reference/WP_Query

Also, you can use $the_query->found_posts to get the total number.