Add Recent Post shortcode

add_recent_post_shortcode.php

// Shortcode for recent post

add_shortcode('ss_recentpost','ss_recent_post');
// add_filter('the_content', 'do_shortcode', 11);



add_filter('widget_text', 'do_shortcode');

function ss_recent_post($attr) {
  global $post;
	ob_start();
	
	
	$setting = shortcode_atts(array(
				'numberposts' => 3,
				'category' => null,
				'thumbnail' => false,
				'length' => 10
				), $attr );
	extract($setting);
	$output = "";
	$arg = "numberposts=".$numberposts;
	
	if($category) {
		$category_id = get_cat_ID($category);
		$arg .="&category=".$category_id; 
	}
	
	$posts = get_posts($arg);
	foreach( $posts as $post ) {
		setup_postdata( $post );
		?>
		<div class="recent-post-wigdet">
<?php 
		if ( has_post_thumbnail() && $thumbnail == true ) : ?>
		<span class="post-thumb">
		<a href="<?php the_permalink(); ?>" title="<?php the_title_attribute(); ?>" ><?php the_post_thumbnail('small-thumbnail'); ?></a>
		</span>
<?php endif;?>		
			<div class="recent-post-container">
				<h4><a href="<?php the_permalink($post-ID) ?>"><?php the_title() ?></a></h4>
				<p>
				<?php echo wp_trim_words( $post->post_content, $length, $more = "<span>...</span>" ); ?>
				</p>
				<span class="smore"><a href="<?php echo the_permalink($post-ID) ?>">Read More </a></span>
			</div>
		</div>
		
<?php 
		}
		
		// to retur anywhere in Contents
		$output = ob_get_contents();
		ob_end_clean();
		return $output;
		
	};