我创建了一个搜索表单，通过类别过滤器和关键字输入进行搜索。搜索表单代码在此处-

<form action="<?php bloginfo(\'url\'); ?>" method="get" role="search" class="dropdown-form">
                <div class="input-group">
                        <span class="input-group-addon">
                            <?php
                            wp_dropdown_categories(array(
                                \'show_option_all\'   => \'all categories\',
                                \'class\'             => \'search_cats\'
                            ));
                            ?>
                        </span>
                    <input type="search" class="form-control" placeholder="<?php esc_html_e(\'Search anything...\', \'onepro\'); ?>" name="s">
                    <span class="input-group-addon">
                        <button type="submit"><i class="ion-android-arrow-forward"></i></button>
                    </span>
                </div>
            </form>

然后我添加了pre_get_posts 钩住底部functions.php 文件-

add_action(\'pre_get_posts\', function() {
  global $wp_query;
  if (is_search()) {
    $cat = intval($_GET[\'cat\']);
    $cat = ($cat > 0) ? $cat : \'\';
    $wp_query->query_vars[\'cat\'] = $cat;
  }
});

搜索表单也在运行。但下面的告示出现在我使用的地方WP_Query() 显示职位类别的步骤-

注意：is\\U search调用不正确。运行查询之前，条件查询标记不起作用。在此之前，它们总是返回false。有关详细信息，请参阅WordPress中的调试。（此消息是在版本3.1.0中添加的。）在C:\\xampp\\htdocs\\onepro\\wp中包含\\个函数。php在线3996

以下是查询代码-

    global $wp_query;
    global $paged;
    $temp = $wp_query;
    $wp_query = null;
    $wp_query = new WP_Query(array(
        \'post_type\'         => \'post\',
        \'posts_per_page\'    => $atts[\'show_posts\'],
        \'paged\'             => $paged,
    ));

    if ( $wp_query->have_posts() ) :

        $all_cat_slug = array();
        while ( $wp_query->have_posts() ) : $wp_query->the_post();
            $category = get_the_category();
            foreach( $category as $cat ){
                array_push($all_cat_slug, $cat->slug);
            }
        endwhile;
        $all_cat_slug = array_unique( $all_cat_slug );

    endif;

        <!--Portfolio Filter-->
        <div class="row filters_row text-left">
            <ul class="nav navbar-nav" id="blogs_filters">
                <li data-filter="*" class="active"><?php echo esc_html__(\'all\', \'onepro-essential\'); ?></li>
                <?php
                foreach( $all_cat_slug as $cs ){
                    $catname = get_category_by_slug( $cs );
                    echo \'<li data-filter=".category-\'. $cs .\'">\'. $catname->name .\'</li>\';
                }
                ?>
            </ul>
        </div>

错误通知出现在显示错误屏幕截图的类别之前- 如何解决此问题？

add_action(\'pre_get_posts\', function( \\WP_Query $q ) {
    if ( 
            ! is_admin()         // Only target the front-end
         && $q->is_main_query()  // Target the main query
         && $q->is_search()      // Target a search query
    ) {
        // do stuff
    }
});

$wp_query = null; to //$wp_query = null;