因此，我创建的这个小部件正在杀死在同一提要栏中注册的所有其他小部件。也就是说，在这个小部件完成后，不会呈现任何内容。没有其他小部件标记可以将其添加到DOM中。经过数小时的拉扯，我发现罪魁祸首与\\u get\\u featured\\u posts（）中的get\\u posts方法有关。这就像调用该方法停止所有其他小部件处理一样。以下是我的小部件代码：

class Featured_newsroom_posts extends WP_Widget {
function __construct() {
    parent::__construct(
        \'featured_newsroom_posts\', // Base ID
        __(\'CUMC: Featured Newsroom Posts\', \'text_domain\'), // Name
        array( \'description\' => __( \'Featured posts to show on the newsroom homepage ordered by publish date.\', \'text_domain\' ), ) // Args
    );
}

public function widget( $args, $instance ) {
    $title = apply_filters( \'widget_title\', $instance[\'title\'] );
    echo $args[\'before_widget\'];
    if ( ! empty( $title ) ){
        echo $args[\'before_title\'] . $title . $args[\'after_title\'];
    }

    $featured_posts = $this->_get_featured_posts();
    if (!empty($featured_posts)) {
        $count = 1;
        foreach ($featured_posts as $inner) {
            echo \'
                <article class="headline">
                    <a href="\' . $inner->guid . \'">
                        <strong class="headline-source">\' . $inner->post_title . \'</strong>
                    </a>
                </article>\';
            if ($count === (int)$instance[\'count\']) {
                break;
            }
            $count++;
        }
    } else {
        echo \'No recent posts found.\';
    }
    echo $args[\'after_widget\'];
}

public function form( $instance ) {
    if ( isset( $instance[\'title\'] ) ) {
        $title = $instance[\'title\'];
    }
    else {
        $title = __( \'Featured Posts\', \'text_domain\' );
    }
    ?>
    <p>
        <label for="<?php echo $this->get_field_id( \'title\' ); ?>"><?php _e( \'Title:\' ); ?></label> 
        <input class="widefat" id="<?php echo $this->get_field_id( \'title\' ); ?>" name="<?php echo $this->get_field_name( \'title\' ); ?>" type="text" value="<?php echo esc_attr( $title ); ?>" />
        <p></p>
        <label for="<?php echo $this->get_field_id( \'count\' ); ?>"><?php _e( \'Number of posts to display:\' ); ?></label>
        <select name="<?php echo $this->get_field_name( \'count\' ); ?>">
            <?php 
                for($i = 1; $i <= 8; $i++){
                    echo \'<option value="\' . $i . \'" \' . ($i === (int)$instance[ \'count\' ] ? \'selected\' : \'\' ) . \'>\' . $i . \'</option>\';
                }
            ?>
        </select>
    </p>
    <?php 
}

public function update( $new_instance, $old_instance ) {
    $instance = array();
    $instance[\'title\'] = ( ! empty( $new_instance[\'title\'] ) ) ? strip_tags( $new_instance[\'title\'] ) : \'\';
    $instance[\'count\'] = $new_instance[\'count\'];

    return $instance;
}

private function _get_featured_posts(){
    global $wpdb;
    //Get all the blog ids
    $sites = wp_get_sites(array(\'public\' => 1, \'offset\' => 1));

    $all_posts = array();
    foreach($sites as $site) {
        switch_to_blog($site[\'blog_id\']);
        //Find posts that are marked for listing in the newsroom
        $posts = get_posts(array(\'meta_key\' => \'list_in_newsroom\', \'meta_value\' => \'1\'));
        if($posts){
            $all_posts = array_merge($all_posts, $posts);
        }
    }
    restore_current_blog();
    return $all_posts;
}
}

function register_custom_widgets() {
register_widget( \'Featured_newsroom_posts\' );
}
add_action( \'widgets_init\', \'register_custom_widgets\' );