images with fallbacks

Image-Waterfall.php

// let's go through and get the right image
function dg_thumb_waterfall() {

	global $post;

	if ( has_post_thumbnail($post->ID) ) {
		echo '<div class="thumbnail-wrapper">';
		the_post_thumbnail('digi-med-thumb');
		echo '</div>';

	} else {

	// get the category for the post and show the image
		$category = get_the_category($post->ID);
		$cat_slug = $category[0]->slug;
		$cat_name = $category[0]->cat_name;	

	// let's grab the first image in the post
		$content	= $post->post_content;
		$output		= preg_match('/<img.+src=[\'"]([^\'"]+)[\'"].*>/i', $content, $matches);

	if(!empty($matches))
		$first_img = $matches [1] [0];

	// if there's no first post, lets use a default
	if(empty($matches)) {
		$img_fb_sc = get_bloginfo('stylesheet_directory').'/library/images/'.$cat_slug.'.jpg';
		$first_img = '<div class="thumbnail-wrapper"><img width="200" height="150" class="attachment-digi-med-thumb wp-post-image no-thumb-fallback" src="'.$img_fb_sc.'" alt="' . $cat_name . '" /></div>';
	}

	// display what we've got
	return $first_img;	
	}
}