Get the latest comments for a custom post type in WordPress

Custom post types for WordPress support comments, however the API doesn’t allow for retrieving those comments.

So in order to get the latest comments from your custom post type you need to do an sql query that does a LEFT OUTER JOIN between the comments table and the posts table:

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/* Get recent comments */
global $wpdb;
 
$sql = "SELECT * FROM $wpdb->comments LEFT OUTER JOIN $wpdb->posts ON ($wpdb->comments.comment_post_ID = $wpdb->posts.ID) WHERE comment_approved = '1' AND comment_type = '' AND post_password = '' AND post_type='your_custom_post_type' ORDER BY comment_date_gmt DESC LIMIT 5";
 
$comments = $wpdb->get_results($sql);
 
foreach ($comments as $comment) {
  // we need the comment comment user_id in case it's a logged in user so we can echo the display name and not username
  if ($comment->user_id != 0) {
    $curent_userdata = get_userdata($comment->user_id);
    echo $curent_userdata->display_name;
  } else {
    echo strip_tags($comment->comment_author);
  }
 
  // the permalink for the comment
  echo get_permalink($comment->ID) . '#comment-' . $comment->comment_ID;
 
  // the post title where that comment was posted
  echo $comment->post_title; 
 
  // display the comment content
  echo strip_tags($comment->comment_content);
}

The important bit is in the SQL declaration:

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post_type='your_custom_post_type'

Let’s transform this into a widget

I’m not going to go through all the steps needed to create a widget for WordPress, instead I’ll just give you the code so you can use in your own projects.

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<?php
/*
Plugin Name: Latest CPT Comments Plugin
Plugin URI: http://www.cozmoslabs.com/
Description: Display the latest comments on a custom post type
Version: 0.1
Author: Cristian Antohe
Author URI: http://cozmoslabs.com
License: GPL2
 
== Copyright ==
Copyright 2011 Reflection Media (wwww.reflectionmedia.ro)
 
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
 
add_action( 'widgets_init', 'cl_cpt_comments_load_widgets' );
 
function cl_cpt_comments_load_widgets() {
	register_widget( 'cl_cpt_comments_Widget' );
}
 
class cl_cpt_comments_Widget extends WP_Widget {
 
	/**
	 * Widget setup.
	 */
	function cl_cpt_comments_Widget() {
		/* Widget settings. */
		$widget_ops = array( 'classname' => 'cl_cpt_comments_widget', 'description' => __('A widget that displays your latest custom post type comments', 'cl_cpt_comments_widget') );
 
		/* Widget control settings. */
		$control_ops = array( 'width' => 250, 'height' => 350, 'id_base' => 'cl_cpt_comments_widget' );
 
		/* Create the widget. */
		$this->WP_Widget( 'cl_cpt_comments_widget', __('Latest custom post type comments', 'cl_cpt_comments_widget'), $widget_ops, $control_ops );
	}
 
	/**
	 * How to display the widget on the screen.
	 */
	function widget( $args, $instance ) {
		extract( $args );
 
		/* Our variables from the widget settings. */
		$title = apply_filters('widget_title', $instance['title'] );
		$number = $instance['number'];
 
		/* Before widget (defined by themes). */
		echo $before_widget;
 
		/* Display the widget title if one was input (before and after defined by themes). */
		if ( $title )
			echo '<h3 class="widget-title">' . $title . '</h4>';
 
		/* Get recent comments */
		global $wpdb;
		$sql = "SELECT * FROM $wpdb->comments LEFT OUTER JOIN $wpdb->posts ON ($wpdb->comments.comment_post_ID = $wpdb->posts.ID) WHERE comment_approved = '1' AND comment_type = '' AND post_password = '' AND post_type='your_custom_post_type' ORDER BY comment_date_gmt DESC LIMIT $number";
		$comments = $wpdb->get_results($sql);
		echo '<ul class="cpt-comments">';
		foreach ($comments as $comment) {
			if ($comment->user_id != 0) {
				$curent_userdata = get_userdata($comment->user_id);
				$current_comment_display_name = $curent_userdata->display_name;
			} else {
				$current_comment_display_name = strip_tags($comment->comment_author);
			}						
		?>
			<li class="cpt-comment">
				<p class="comment-cpt-title"><a href="<?php echo get_permalink($comment->ID); ?>#comment-<?php echo $comment->comment_ID; ?>" rel="bookmark"><?php echo get_the_title($comment->comment_post_ID); ?></a></p>
				<p class="comment-author"><?php echo $current_comment_display_name  ?> says:</p><a class="comment-text-side" href="<?php echo get_permalink($comment->ID); ?>#comment-<?php echo $comment->comment_ID; ?>" title="<?php echo strip_tags($comment->comment_author); ?> on <?php echo $comment->post_title; ?>"><?php echo strip_tags($comment->comment_content); ?></a>
			</li>
		<?php 
		}
		echo '</ul>';
 
		/* After widget (defined by themes). */
		echo $after_widget;
	}
 
	/**
	 * Update the widget settings.
	 */
	function update( $new_instance, $old_instance ) {
		$instance = $old_instance;
 
		/* Strip tags for title and name to remove HTML (important for text inputs). */
		$instance['title'] = strip_tags( $new_instance['title'] );
		$instance['number'] = strip_tags( $new_instance['number'] );
 
		return $instance;
	}
 
 
	function form( $instance ) {
 
		/* Set up some default widget settings. */
		$defaults = array( 'title' => __('Latest CPT Comments'), 'number' => __('5'));
		$instance = wp_parse_args( (array) $instance, $defaults ); ?>
 
		<!-- Widget Title: Text Input -->
		<p>
			<label for="<?php echo $this->get_field_id( 'title' ); ?>"><?php _e('Title:', 'hybrid'); ?></label>
			<input id="<?php echo $this->get_field_id( 'title' ); ?>" name="<?php echo $this->get_field_name( 'title' ); ?>" value="<?php echo $instance['title']; ?>" style="width:90%;" />
		</p>
 
		<!-- Number of posts -->
		<p>
			<label for="<?php echo $this->get_field_id( 'number' ); ?>"><?php _e('Number of posts to show:'); ?></label>
			<input id="<?php echo $this->get_field_id( 'number' ); ?>" name="<?php echo $this->get_field_name( 'number' ); ?>" value="<?php echo $instance['number']; ?>" size="3" />
		</p>
 
 
 
 
	<?php
	}
}
 
?>

Next you need to copy this code, put it inside the plugins directory, activate the plugin and you’re ready to go. Don’t forget to change the custom post type to your own.

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10 thoughts on “Get the latest comments for a custom post type in WordPress

  1. wow. nice information you got here. I hope that you can elaborate more on the sidebar topic. because one of my Articles have the same problem with that. so if you can tell me more how to fix it, it would be nice!
    Thanks!

  2. You can even way (short record)

    $args = array(
    ‘parent’=>0
    ‘post_type’ => ‘custom-post-type’,
    ‘number’ => ‘1’,
    ‘orderby’ => ‘date’,
    ‘order’ => ‘DESC’
    );

    $comments = get_comments($args);
    foreach($comments as $comment) :
    echo($comment->comment_author . ” . $comment->comment_content);
    endforeach;

  3. Hi there! Thanks a lot for this solution. Is it also possible to show the latest comment for a specific posttype as a shortcode instead?

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