// Displays the first category of a given portfolio post, but show all cateegories on the single post

gistfile1.txt

function wpex_portfolio_first_cat($postid=false) {
		global $post;
		$postid = $postid ? $postid : $post->ID;		
		$cats = get_the_terms( $postid, 'portfolio_category' );
		$output = '';	
		if( $cats ) {
			$cats_count = count($cats);
			if ( is_singular('portfolio') ) {
				$count=0;
				foreach( $cats as $cat ) {
					$count++;
					if ( $cats_count == $count ) {
						$output .= '<a href="'. get_term_link($cat->slug, 'portfolio_category') .'" title="'. $cat->name .'">'. $cat->name .'</a>';
					} else {
						$output .= '<a href="'. get_term_link($cat->slug, 'portfolio_category') .'" title="'. $cat->name .'">'. $cat->name .'</a>, ';
					}
				}
			} else {
				$count=0;
				foreach( $cats as $cat ) {
					$count++;
					if ( $count == 1 ) {
						$output .= '<a href="'. get_term_link($cat->slug, 'portfolio_category') .'" title="'. $cat->name .'">'. $cat->name .'</a>';
					}
				}

			}
		}
		return $output;
	}