侧边栏

一、第一种

//侧边栏文章列表，小工具的定义、注册和加载
class Recent_Category_Posts_Widget extends WP_Widget {

    public function __construct() {
        parent::__construct(
            'recent_category_posts_widget',
            '最近分类文章小工具',
            array('description' => '显示当前分类的最近文章列表，并高亮当前文章')
        );
    }

    public function widget($args, $instance) {
        echo $args['before_widget'];
        
        $categories = get_the_category();
        $category_name = !empty($categories) ? esc_html($categories[0]->name . " 验厂") : '';
        
        ?>
        <div class="recent-category-posts">
            <div class="widget-title">
                <i class="fa fa-list" aria-hidden="true"></i>
                <span><?php echo $category_name; ?></span>
            </div>
            <ul class="post-list">
                <?php
                $current_post_id = get_the_ID();
                if (!empty($categories)) {
                    $current_category_id = $categories[0]->term_id;

                    $recent_posts = get_posts(array(
                        'numberposts' => 20,
                        'post_status' => 'publish',
                        'category' => $current_category_id
                    ));

                    foreach ($recent_posts as $post) :
                        $post_title = $post->post_title;
                        $post_url = get_permalink($post->ID);
                        $is_current = ($post->ID == $current_post_id) ? 'current-post' : '';
                        ?>
                        <li class="<?php echo $is_current; ?>">
                            <a href="<?php echo esc_url($post_url); ?>" title="<?php echo esc_attr($post_title); ?>">
                                <?php echo esc_html($post_title); ?>
                            </a>
                        </li>
                    <?php
                    endforeach;
                }
                ?>
            </ul>
        </div>
        <?php
        echo $args['after_widget'];
    }

    public function form($instance) {
        // Widget admin form
    }

    public function update($new_instance, $old_instance) {
        // Save widget options
        return $new_instance;
    }
}

function register_recent_category_posts_widget() {
    register_widget('Recent_Category_Posts_Widget');
}
add_action('widgets_init', 'register_recent_category_posts_widget');