这里不涉及编码。Wordpress已经有一个用于此功能的内置小部件。如果您转到“Widgets”屏幕。您将看到有一个名为Categories的小部件

您可以将其拖放到需要显示小部件的侧栏中。完成此操作后，小部件将打开，从那里您可以勾选“显示帖子数量”框以显示类别的帖子数量。

class Shaka_Categories_Widget extends WP_Widget{
    function __construct() {
        parent::__construct(
            \'shaka_categories_widget\', // Base ID
            \'Shaka Categories\', // Name
            array(\'description\' => __( \'Displays post Categories with counts\'))
           );
    }
    function update($new_instance, $old_instance) {
        $instance = $old_instance;
        $instance[\'title\'] = strip_tags($new_instance[\'title\']);
        //$instance[\'post_type\'] = strip_tags($new_instance[\'post_type\']);
        //$instance[\'numberOfListings\'] = strip_tags($new_instance[\'numberOfListings\']);
        return $instance;
    }
    function form($instance) {
        if( $instance) {
            $title = esc_attr($instance[\'title\']);
        } else {
            $title = \'\';
        }
        ?>
            <p>
            <label for="<?php echo $this->get_field_id(\'title\'); ?>"><?php _e(\'Title\', \'sim_most_viewed\'); ?></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 $title; ?>" />
            </p>

        <?php
    }
    function widget($args, $instance) {
        extract( $args );
        $title = apply_filters(\'widget_title\', $instance[\'title\']);

        echo $before_widget;
        if ( $title ) {
            echo $before_title . $title . $after_title;
        }
        $this->getMostViewedListings();
        echo $after_widget;
    }
    function getMostViewedListings() { //html
        $args = array(
        \'type\' => \'post\'
        );
        $categories = get_categories($args);
        //echo "<pre>";var_dump($categories);echo "</pre>";
        if($categories){
            echo "<ul>";
            foreach($categories as $cat){
                echo "<li><a href=\'".site_url().\'/category/\'.$cat->slug."\'  class=\'cat-item cat-item-".$cat->term_id."\'>".$cat->name." <span class=\'post-count\'>".$cat->count."</span></a></li>";
            }   
            echo "</ul>";
        }
    }


} //end class

register_widget(\'Shaka_Categories_Widget\');