Tạo shortcode bài viết liên quan trong WordPress

/**
 * Shortcode to display the most recent posts
 * The attributes passed into the function will be passed into the WP_Query object to modify the query
 * By default the last 10 posts will be displayed
 * 
 * @param $atts
 * @param $content
 * 
 * @return string
 */
function pu_recent_posts_shortcode($atts, $content = NULL)
{
    $atts = shortcode_atts(
        [
            'orderby' => 'date',
            'posts_per_page' => '10'
        ], $atts, 'recent-posts' );
 
    $query = new WP_Query( $atts );
 
    $output = '
<ul class="recent-posts">';
 
    while($query->have_posts()) : $query->the_post();
 
        $output .= '
<li><a href="' . get_permalink() . '">' . get_the_title() . '</a> - <small>' . get_the_date() . '</small></li>
 
';
 
    endwhile;
 
    wp_reset_query();
 
    return $output . '</ul>
 
';
}
add_shortcode('recent-posts', 'pu_recent_posts_shortcode');