Wordpress widget to show Recent Comments with pingbacks or trackbacks.

recent-comments-without-pingbacks.php

<?php

/**
This is a straight copy of the the default Wordpress 3.5.2 Recent Comments widget which has been modified
to only show actual comments and to not display pingbacks and trackbacks in the sidebar. To use this
widget just add it to your theme directory and put the line "require('recent-comments-without-pingbacks.php');""
in your theme's 'functions.php' file.
**/

class Recent_Comments_Clean extends WP_Widget {

  function __construct() {
		$widget_ops = array('classname' => 'widget_recent_comments_clean', 'description' => __( 'The most recent comments without pingbacks' ) );
		parent::__construct('recent-comments-clean', __('Recent Comments without Pingbacks'), $widget_ops);
		$this->alt_option_name = 'widget_recent_comments_clean';

		if ( is_active_widget(false, false, $this->id_base) )
			add_action( 'wp_head', array($this, 'recent_comments_clean_style') );

		add_action( 'comment_post', array($this, 'flush_widget_cache') );
		add_action( 'transition_comment_status', array($this, 'flush_widget_cache') );
	}

	function recent_comments_clean_style() {
		if ( ! current_theme_supports( 'widgets' ) // Temp hack #14876
			|| ! apply_filters( 'show_recent_comments_clean_widget_style', true, $this->id_base ) )
			return;
		?>
	<style type="text/css">.recentcomments a{display:inline !important;padding:0 !important;margin:0 !important;}</style>
<?php
	}

	function flush_widget_cache() {
		wp_cache_delete('widget_recent_comments_clean', 'widget');
	}

	function widget( $args, $instance ) {
		global $comments, $comment;

		$cache = wp_cache_get('widget_recent_comments_clean', 'widget');

		if ( ! is_array( $cache ) )
			$cache = array();

		if ( ! isset( $args['widget_id'] ) )
			$args['widget_id'] = $this->id;

		if ( isset( $cache[ $args['widget_id'] ] ) ) {
			echo $cache[ $args['widget_id'] ];
			return;
		}

 		extract($args, EXTR_SKIP);
 		$output = '';
		$title = apply_filters( 'widget_title', empty( $instance['title'] ) ? __( 'Recent Comments' ) : $instance['title'], $instance, $this->id_base );

		if ( empty( $instance['number'] ) || ! $number = absint( $instance['number'] ) )
 			$number = 5;

		$comments = get_comments( apply_filters( 'widget_comments_args', array( 'number' => $number, 'status' => 'approve', 'post_status' => 'publish', 'type'=> 'comment') ) ) );
		$output .= $before_widget;
		if ( $title )
			$output .= $before_title . $title . $after_title;

		$output .= '<ul id="recentcomments">';
		if ( $comments ) {
			// Prime cache for associated posts. (Prime post term cache if we need it for permalinks.)
			$post_ids = array_unique( wp_list_pluck( $comments, 'comment_post_ID' ) );
			_prime_post_caches( $post_ids, strpos( get_option( 'permalink_structure' ), '%category%' ), false );

			foreach ( (array) $comments as $comment) {
				$output .=  '<li class="recentcomments">' . /* translators: comments widget: 1: comment author, 2: post link */ sprintf(_x('%1$s on %2$s', 'widgets'), get_comment_author_link(), '<a href="' . esc_url( get_comment_link($comment->comment_ID) ) . '">' . get_the_title($comment->comment_post_ID) . '</a>') . '</li>';
			}
 		}
		$output .= '</ul>';
		$output .= $after_widget;

		echo $output;
		$cache[$args['widget_id']] = $output;
		wp_cache_set('widget_recent_comments_clean', $cache, 'widget');
	}

	function update( $new_instance, $old_instance ) {
		$instance = $old_instance;
		$instance['title'] = strip_tags($new_instance['title']);
		$instance['number'] = absint( $new_instance['number'] );
		$this->flush_widget_cache();

		$alloptions = wp_cache_get( 'alloptions', 'options' );
		if ( isset($alloptions['widget_recent_comments_clean']) )
			delete_option('widget_recent_comments_clean');

		return $instance;
	}

	function form( $instance ) {
		$title = isset($instance['title']) ? esc_attr($instance['title']) : '';
		$number = isset($instance['number']) ? absint($instance['number']) : 5;
?>
		<p><label for="<?php echo $this->get_field_id('title'); ?>"><?php _e('Title:'); ?></label>
		<input class="widefat" id="<?php echo $this->get_field_id('title'); ?>" name="<?php echo $this->get_field_name('title'); ?>" type="text" value="<?php echo $title; ?>" /></p>

		<p><label for="<?php echo $this->get_field_id('number'); ?>"><?php _e('Number of comments to show:'); ?></label>
		<input id="<?php echo $this->get_field_id('number'); ?>" name="<?php echo $this->get_field_name('number'); ?>" type="text" value="<?php echo $number; ?>" size="3" /></p>
<?php
	}
}

add_action( 'widgets_init', create_function( '', 'register_widget("Recent_Comments_Clean");' ) );