Add Portfolio taxonomy To Body Class

// add classes to body based on custom taxonomy portfolio_cats
function wpex_port_tax_body_class( $classes ) {
	if('portfolio' == get_post_type() ) {
		global $post;
		$terms = get_the_terms( $post->ID, 'portfolio_cats' );
		if($terms) {
			foreach ($terms as $term) {
				$term_classes[] = 'portfolio-' . $term->slug;
			}
			$classes = array_merge( $classes, $term_classes );
		}
	}
	return $classes;
}
add_filter( 'body_class', 'wpex_port_tax_body_class' );