网上有很多关于短代码的教程和一些很好的例子here

但为了让你开始：

add_shortcode(\'film_q\', \'film_shortcode_query\');
function film_shortcode_query($atts, $content){
  extract(shortcode_atts(array( // a few default values
   \'posts_per_page\' => \'1\',
   \'post_type\' => \'film\',
   \'caller_get_posts\' => 1)
   , $atts));

  global $post;

  $posts = new WP_Query($atts);
  $output = \'\';
    if ($posts->have_posts())
        while ($posts->have_posts()):
            $posts->the_post();
            $out = \'<div class="film_box">
                <h4>Film Name: <a href="\'.get_permalink().\'" title="\' . get_the_title() . \'">\'.get_the_title() .\'</a></h4>
                <p class="Film_desc">\'.get_the_content().\'</p>\';
                // add here more...
            $out .=\'</div>\';
    /* these arguments will be available from inside $content
        get_permalink()  
        get_the_content()
        get_the_category_list(\', \')
        get_the_title()
        and custom fields
        get_post_meta($post->ID, \'field_name\', true);
    */
    endwhile;
  else
    return; // no posts found

  wp_reset_query();
  return html_entity_decode($out);
}

[film_q p=FILM_POST_ID]

希望这有帮助