Bagaimana untuk membangunkan pemalam WordPress yang menjana jadual kandungan secara automatik

class AutoTOC_Widget extends WP_Widget {
    
    public function __construct() {
        parent::__construct(
            'auto_toc_widget',
            '自动生成目录',
            array( 'description' => '在文章中自动生成目录' )
        );
    }
    
    public function widget( $args, $instance ) {
        // 在文章中显示自动生成的目录
    }
    
    public function form( $instance ) {
        // 小部件设置表单
    }
    
    public function update( $new_instance, $old_instance ) {
        // 更新小部件设置
    }
}

public function widget( $args, $instance ) {
    global $post;
    
    $post_id = $post->ID;
    $post_content = $post->post_content;
    
    // 正则表达式匹配所有标题元素
    preg_match_all( '/<h([1-6])>(.*?)</h
>/', $post_content, $matches, PREG_SET_ORDER );
    
    $toc_items = array();
    
    // 构建目录项数组
    foreach ( $matches as $match ) {
        $toc_item = array(
            'title' => $match[2],
            'level' => $match[1],
            'anchor' => sanitize_title( $match[2] )
        );
        
        $toc_items[] = $toc_item;
    }
    
    // 显示目录部件的HTML输出
}

public function widget( $args, $instance ) {
    global $post;
    
    $post_id = $post->ID;
    
    // 生成目录HTML输出
    $output = '<div class="auto-toc">';
    $output .= '<h2 class="widget-title">' . $instance['title'] . '</h2>';
    $output .= '<ul>';
    
    foreach ( $toc_items as $item ) {
        $output .= '<li><a href="#' . $item['anchor'] . '">' . $item['title'] . '</a></li>';
    }
    
    $output .= '</ul>';
    $output .= '</div>';
    
    echo $output;
}

public function form( $instance ) {
    $title = isset( $instance['title'] ) ? $instance['title'] : '目录';
    
    echo '<p>';
    echo '<label for="' . $this->get_field_id( 'title' ) . '">标题:</label>';
    echo '<input class="widefat" id="' . $this->get_field_id( 'title' ) . '" name="' . $this->get_field_name( 'title' ) . '" type="text" value="' . esc_attr( $title ) . '">';
    echo '</p>';
}