Top-Level Slug Function for Wordpress

wp-fn-topslug

function top_slug($post){
	
	if(count($post->ancestors)>0){
		/* if in a sub section */
		$parent_permalink = get_permalink($post->ancestors[count($post->ancestors)-1]);
		echo basename($parent_permalink);
	}else{
		$permalink = get_permalink($post->ID);
		if($permalink===get_bloginfo('url')."/"){
			/* if on home page */
			return "home";
		}else{
			/* if in a top level section */
			return basename($permalink);
		}	
	}
	
}