'Vocabulary 10', 'old' => 'Old term', 'new' => 'New term', ); $project_issue_comment_changes_array['taxonomy_vid_11'] = array( 'label' => 'Vocabulary 11', 'old' => '', 'new' => 'New term (no old term)', ); $project_issue_comment_changes_array['taxonomy_vid_12'] = array( 'label' => 'Vocabulary 12', 'old' => 'Old term (no new term)', 'new' => '', ); }