Gallery shortcode

gistfile1.phtml

//Gallery shortcode
 function gallerys_shortcode($atts, $content){
extract( shortcode_atts (array( // a few default values
   )
   , $atts));

	$q = new WP_Query(
	
		array('posts_per_page' => 3, 'post_type' => 'gallery-items', 'order' => 'ASC', )
	);
	$list = ' <div class="row">';
	
	while($q->have_posts()) : $q->the_post();
			$saved_post_id =  get_the_ID();
	$feat_image = wp_get_attachment_url( get_post_thumbnail_id( $saved_post_id ) );
			$list .= '
			
			
			
			<div class="col-xs-12 col-sm-4 col-md-4">
                    	<figure class="thumbnail text-center">
                        	<a  rel="lightbox[group]" href="'.$feat_image.'">
                           	'.get_the_post_thumbnail( get_the_ID(), 'gallery-image' ).'
                            <img src="'. get_template_directory_uri() .'/images/g-hover.png" class="round" alt=""/>
                             </a>
                            <img src="'. get_template_directory_uri() .'/images/g-shadow.png"  alt=""/> 
                        </figure>
                    </div>';
		
	endwhile;
	$list.= '</div>';
	wp_reset_query();
	return $list;
}

add_shortcode('gallery','gallerys_shortcode');