// Translators: 1 is category, 2 is tag, 3 is the date and 4 is the author's name.
if ( $tag_list ) {
$utility_text = __( 'This entry was posted in %1$s and tagged %2$s on %3$s<span class="by-author"> by %4$s</span>.', 'twentytwelve' );
} elseif ( $categories_list ) {
$utility_text = __( 'This entry was posted in %1$s on %3$s<span class="by-author"> by %4$s</span>.', 'twentytwelve' );
} else {
$utility_text = __( 'This entry was posted on %3$s<span class="by-author"> by %4$s</span>.', 'twentytwelve' );
}
printf(
$utility_text,
$categories_list,
$tag_list,
$date,
$author
);