Column function

column.php

		/* If displaying the 'schwierigkeit' column. */
		case 'schwierigkeit' :

			/* Get the schwierigkeit for the post. */
			$terms = get_the_terms( $post_id, 'schwierigkeit' );

			/* If terms were found. */
			if ( !empty( $terms ) ) {

				$out = array();

				/* Loop through each term, linking to the 'edit posts' page for the specific term. */
				foreach ( $terms as $term ) {
					$out[] = sprintf( '<a href="%s">%s</a>',
						esc_url( add_query_arg( array( 'post_type' => $post->post_type, 'schwierigkeit' => $term->slug ), 'edit.php' ) ),
						esc_html( sanitize_term_field( 'name', $term->name, $term->term_id, 'schwierigkeit', 'display' ) )
					);
				}

				/* Join the terms, separating them with a comma. */
				echo join( ', ', $out );
			}

			/* If no terms were found, output a default message. */
			else {
				_e( 'Keine Schwierigkeit' );
			}

			break;