Disqus Recents Widget basato su JSON per WordPress. Per saperne di più e capire come utilizzare il plugin dai un'occhiata all'articolo ufficiale su https://wp.me/pdQ5q-dC2 (a partire dalle 9:30 del 26/10/2020).

disqusrecents_json.php

<?php
/*
	Plugin Name: Disqus Recent Comments
	Plugin URI: https://gioxx.org/
	Description: Show the latest comments from Disqus (using API 3.0 and JSON).
	Author: Gioxx
	Version: 0.1
	Author URI: https://gioxx.org
	License: GPL2
*/

/*
	Credits:	https://help.disqus.com/en/articles/1717320-widgets
				https://disqus.com/api/docs/
				https://disqus.com/api/docs/forums/listPosts/
				https://github.com/TaltonFiggins/disqus-recent-comments/blob/master/disqus-recent-comments.php
				https://wordpress.stackexchange.com/a/112578
				https://wordpress.stackexchange.com/a/20034
				https://stackoverflow.com/a/19164186
				https://stackoverflow.com/a/10142695
*/

class wdg_DsqRcnCmmJSON extends WP_Widget {
	public function __construct() {
		parent::__construct(
	 		'DisqusRecentComments_Widget', // Base ID
			'(GX) Disqus Recent Comments (JSON)', // Name
			array( 'description' => __( 'Show the latest comments from Disqus', 'text_domain' ), ) // Args
		);
	}

	public function widget( $args, $instance ) {
		extract( $args );
		$title = apply_filters( 'widget_title', $instance['title'] );
		$jsonsource = $instance[ 'jsonsource' ];
		$cmnts_load = $instance[ 'cmnts_load' ];
		$avatar = $instance[ 'avatar' ] ? 'true' : 'false';
		
		echo $before_widget;
		if ( ! empty( $title ) )
		echo $before_title . $title . $after_title;

		$request = wp_safe_remote_get($jsonsource);
		if( is_wp_error( $request ) ) {
			return false; // Bail early
		}
		$body = wp_remote_retrieve_body( $request );
		$data = json_decode( $body );

		if( ! empty( $data ) ) {
			$limit = 0;
			foreach( $data->response as $response ) {
				$limit++;
				$post_author = $response->author->name;
				$post_author_profileUrl = $response->author->profileUrl;
				$post_author_avatar = $response->author->avatar->small->cache;
				$post_thread_link = $response->thread->link;
				$post_thread_commentlink = $response->url;
				$post_thread_commentdate_Y = substr($response->createdAt,0,4);
				$post_thread_commentdate_M = substr($response->createdAt,5,2);
				$post_thread_commentdate_D = substr($response->createdAt,8,2);
				$post_thread_commentdate_H = substr($response->createdAt,11,5);

				//Checking the length of the comment and trimming it if it's too long
				$post_message  = strip_tags($response->message);
				if(strlen($post_message)>120){
					$post_message = substr($post_message, 0 , 120);
					$post_message = substr($post_message, 0 , strripos($post_message, ' ')).' ...';
				}
				
				//Same for the title
				$post_thread_title = $response->thread->clean_title;
				if(strlen($post_thread_title)>60){$post_thread_title = substr($post_thread_title, 0 , 60);
				$post_thread_title = substr($post_thread_title, 0 , strripos($post_thread_title, ' ')).' ...';}

				echo '<p>';
				if( 'on' == $instance[ 'avatar' ] ) : ?>
					<div class="about-us-avatar">
						<?php echo '<img src="'.$post_author_avatar.'" style="float: right; padding-left: 5px;" />'; ?>
					</div>
				<?php endif;
				echo '	<strong><a href="'.$post_author_profileUrl.'">'.$post_author.'</a></strong> '.$post_message.'<br />
						<small><a href="'.$post_thread_link.'">'.$post_thread_title.'</a> · <a href="'.$post_thread_commentlink.'">'.$post_thread_commentdate_D.'/'.$post_thread_commentdate_M.'/'.$post_thread_commentdate_Y.' '.$post_thread_commentdate_H.'</a></small>
						</p>';

				if ( $limit == $cmnts_load ) break;
			}
		}
		echo $after_widget;
	}

	public function update( $new_instance, $old_instance ) {
		$instance = array();
		$instance['title'] = strip_tags( $new_instance['title'] );
		$instance['jsonsource'] = $new_instance['jsonsource'];
		$instance['cmnts_load'] = $new_instance['cmnts_load'];
		$instance['avatar'] = $new_instance['avatar'];
		return $instance;
	}

	public function form( $instance ) {
		if ( isset( $instance[ 'title' ] ) ) { $title = $instance[ 'title' ]; }
		else { $title = __( '', 'text_domain' ); }
		if ( isset( $instance[ 'jsonsource' ] ) ) { $jsonsource = $instance[ 'jsonsource' ];	}
		else { $jsonsource = __( '', 'text_domain' );	}
		if ( isset( $instance[ 'cmnts_load' ] ) ) { $cmnts_load = $instance[ 'cmnts_load' ];	}
		else { $cmnts_load = __( '', 'text_domain' );	}
		?>
		<p>
			<!-- Widget title -->
			<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 esc_attr( $title ); ?>" />
		</p>
		<p>
			<!-- JSON Source -->
			<label for="<?php echo $this->get_field_id( 'jsonsource' ); ?>"><?php _e( 'JSON URL<br />(example: https://disqus.com/api/3.0/forums/listPosts.json?api_key=PUBLICAPIKEY&forum=gioxx&related=thread). Get your API Key from <a href="https://disqus.com/api/applications/" target="_blank">disqus.com/api/applications</a>:' ); ?></label>
			<input class="widefat" id="<?php echo $this->get_field_id( 'jsonsource' ); ?>" name="<?php echo $this->get_field_name( 'jsonsource' ); ?>" type="text" value="<?php echo esc_attr( $jsonsource ); ?>" />
		</p>
		<p>
			<!-- How many comments? -->
			<label for="<?php echo $this->get_field_id('cmnts_load'); ?>"><?php _e( 'Comments to load:' ); ?></label>
			<select class='widefat' id="<?php echo $this->get_field_id('cmnts_load'); ?>" name="<?php echo $this->get_field_name('cmnts_load'); ?>">
				<?php
					for ($maxcomments=1; $maxcomments<=24; $maxcomments++) { ?>
						<option <?php selected( $instance['cmnts_load'], $maxcomments); ?> value="<?php echo $maxcomments; ?>"><?php echo $maxcomments; ?></option>
				<?php } ?>
			</select>
		</p>
		<p>
			<!--Avatar-->
	    <input class="checkbox" type="checkbox" <?php checked( $instance[ 'avatar' ], 'on' ); ?> id="<?php echo $this->get_field_id( 'avatar' ); ?>" name="<?php echo $this->get_field_name( 'avatar' ); ?>" />
			<label for="<?php echo $this->get_field_id( 'avatar' ); ?>"><?php _e( 'Show avatars' ); ?></label>
		</p>
		<?php
	}

} // Disqus Recent Comments JSON - The End

// Register widget
function src_load_DsqsRecentsWidget() { register_widget( 'wdg_DsqRcnCmmJSON' ); }
add_action( 'widgets_init', 'src_load_DsqsRecentsWidget' );