Add Post Class if Post has thumbnail

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<?php
// add class if post has thumbnail
function has_thumb_class($classes) {
	global $post;
	if( has_post_thumbnail($post->ID) ) { $classes[] = 'has_thumb'; }

		return $classes;
}
add_filter('post_class', 'has_thumb_class');
?>

Instructions:

Add this snippet to your functions.php file to add a post class to any post that uses a featured image.

Related links:

http://codex.wordpress.org/Post_Thumbnails