widget cache

gistfile1.aw

function widget($args, $instance) {
        extract( $args );
        $title = apply_filters('widget_title', $instance['title']);
        ?>
		<?php echo $before_widget; ?>
		<?php if ( $title ) echo $before_title . $title . $after_title; ?>
		<?php
		global $cap, $post;
		
		$cache_key = 'time_widget_'.$this->id;
		
		$posts = wp_cache_get( $cache_key, 'time_widget_cache' );
		
		if( !$posts ) {
			
			echo 'caching';
			
			$post_ids = $cap->editors_picks;
		
			$ids = explode(',', $post_ids);
	
			if( is_array( $ids ) ) {
				
				global $time_post_in;
				
				// lets clean the values
				array_walk( $ids, 'intval' );
				
				// set the global so we can use our filter			
				$time_post_in = $ids;
	
				// turning on filter that will order the posts by the order in which they were entered
				add_filter( 'posts_orderby', 'time_orderby_in' );
				$posts = get_posts( 
					array(
						'post__in' => $ids,
						'posts_per_page' => 3,
						'suppress_filters' => false,
					)
				);
				remove_filter( 'posts_orderby', 'time_orderby_in' );
				
				if( $posts ) {
					wp_cache_set( $cache_key, $posts, 'time_widget_cache', 21600 );
				}
			}
		
		} else {
			echo 'served from cache';
		}

		if( $posts ) : $i = 0;
			?>
			<ul>
			<?php foreach( $posts as $post ) : setup_postdata( $post ); $i++; ?>
				<?php if( has_post_thumbnail( $post->ID ) ) : // dont show it if there no image ?>
					<li<?php if( $i == count($picks) ) echo ' class="last"'; ?>>

						<div class="pick-right">
							<a href="<?php echo esc_url( time_tracking_tag( get_permalink(), 'editpicks' ) ); ?>"><?php the_post_thumbnail('thumb'); ?></a>
						</div>
						<div class="pick-left">
							<div class="entry-category"><?php time_the_slug(); ?></div>
							<h2><a href="<?php echo esc_url( time_tracking_tag( get_permalink(), 'editpicks' ) ); ?>"><?php the_title(); ?></a></h2>
							<span class="pick-author">By <a rel="author" title="Posts by <?php echo get_the_author($post->post_author); ?>" href="<?php echo esc_url( time_tracking_tag( get_author_posts_url($post->post_author), 'editpicks' ) ); ?>"><?php echo get_the_author($post->post_author); ?></a></span><br/>
						</div>

					</li>
				<?php endif; ?>
			<?php endforeach; ?>
			</ul>
			<?php
		endif;
		wp_reset_postdata();		
		echo $after_widget;
    }

    function update( $new_instance, $old_instance ) {
    
    	// bust the cache on update	
    	wp_cache_delete( 'time_widget_'.$this->id, 'time_widget_cache' );
    				
		$instance = $old_instance;
		$instance['title'] = strip_tags($new_instance['title']);
        return $instance;
    }