Display posts using the shortcode [news id='1,2,3'].

gistfile1.txt

<?php
// news
add_shortcode( 'news', 'news_shortcode' );
function news_shortcode( $atts ) {
   extract(shortcode_atts(array(
        'id' => null
    ), $atts, 'news'));    
   $post_ids = explode(",", strval($id));
	
    ob_start();
    $query = new WP_Query( array(
        'post_type' => 'news',
		  //'posts_per_page'=>4,
	     'orderby' => 'post__in',
        'post__in' => $post_ids
    ) );
    if ( $query->have_posts() ) { ?>
      <div class="owl-carousel slidersc">
            <?php while ( $query->have_posts() ) : $query->the_post(); ?>
                        <div class="item">
                            <?php the_post_thumbnail('full'); ?>
						</div>
            <?php endwhile;
               wp_reset_postdata();
			?>
      </div>
    <?php $myvariable = ob_get_clean();
    return $myvariable;
								  return $this->grid($args);
    }
	
}