WordPress/wp-content/themes/twentyeleven/content-gallery.php

<?php
/**
 * Template for displaying posts in the Gallery Post Format
 *
 * Used on index and archive pages.
 *
 * @link https://wordpress.org/support/article/post-formats/
 *
 * @package WordPress
 * @subpackage Twenty_Eleven
 * @since Twenty Eleven 1.0
 */
?>

<article id="post-<?php the_ID(); ?>" <?php post_class(); ?>>
	<header class="entry-header">
		<hgroup>
			<h2 class="entry-title"><a href="<?php the_permalink(); ?>" rel="bookmark"><?php the_title(); ?></a></h2>
			<h3 class="entry-format"><?php _e( 'Gallery', 'twentyeleven' ); ?></h3>
		</hgroup>

		<div class="entry-meta">
			<?php twentyeleven_posted_on(); ?>
		</div><!-- .entry-meta -->
	</header><!-- .entry-header -->

	<?php if ( is_search() ) : // Only display excerpts for search. ?>
		<div class="entry-summary">
			<?php the_excerpt(); ?>
		</div><!-- .entry-summary -->
		<?php else : ?>
		<div class="entry-content">
			<?php if ( post_password_required() ) : ?>
				<?php the_content( __( 'Continue reading <span class="meta-nav">&rarr;</span>', 'twentyeleven' ) ); ?>
				<?php
			else :
				$images = twentyeleven_get_gallery_images();
				if ( $images ) :
					$total_images = count( $images );
					$image        = reset( $images );
					?>
				<figure class="gallery-thumb">
					<a href="<?php the_permalink(); ?>"><?php echo wp_get_attachment_image( $image, 'thumbnail' ); ?></a>
	</figure><!-- .gallery-thumb -->

	<p><em>
					<?php
					printf(
						/* translators: 1: Link attributes, 2: Number of photos. */
						_n( 'This gallery contains <a %1$s>%2$s photo</a>.', 'This gallery contains <a %1$s>%2$s photos</a>.', $total_images, 'twentyeleven' ),
						/* translators: %s: Post title. */
						'href="' . esc_url( get_permalink() ) . '" title="' . esc_attr( sprintf( __( 'Permalink to %s', 'twentyeleven' ), the_title_attribute( 'echo=0' ) ) ) . '" rel="bookmark"',
						number_format_i18n( $total_images )
					);
					?>
					</em></p>
						<?php endif; // End twentyeleven_get_gallery_images() check. ?>
				<?php the_excerpt(); ?>
		<?php endif; ?>
			<?php
			wp_link_pages(
				array(
					'before' => '<div class="page-link"><span>' . __( 'Pages:', 'twentyeleven' ) . '</span>',
					'after'  => '</div>',
				)
			);
			?>
	</div><!-- .entry-content -->
	<?php endif; ?>

	<footer class="entry-meta">
		<?php $show_sep = false; ?>

		<?php
		$categories_list = get_the_category_list( wp_get_list_item_separator() );

		if ( $categories_list ) :
			?>
		<span class="cat-links">
			<?php
			/* translators: 1: CSS classes, 2: List of categories. */
			printf( __( '<span class="%1$s">Posted in</span> %2$s', 'twentyeleven' ), 'entry-utility-prep entry-utility-prep-cat-links', $categories_list );
			$show_sep = true;
			?>
		</span>
		<?php endif; // End if categories. ?>

		<?php
		$tags_list = get_the_tag_list( '', wp_get_list_item_separator() );

		if ( $tags_list && ! is_wp_error( $tags_list ) ) :
			if ( $show_sep ) :
				?>
		<span class="sep"> | </span>
			<?php endif; // End if $show_sep. ?>
		<span class="tag-links">
			<?php
			/* translators: 1: CSS classes, 2: List of tags. */
			printf( __( '<span class="%1$s">Tagged</span> %2$s', 'twentyeleven' ), 'entry-utility-prep entry-utility-prep-tag-links', $tags_list );
			$show_sep = true;
			?>
		</span>
		<?php endif; // End if $tags_list. ?>

		<?php if ( comments_open() ) : ?>
			<?php if ( $show_sep ) : ?>
		<span class="sep"> | </span>
		<?php endif; // End if $show_sep. ?>
		<span class="comments-link"><?php comments_popup_link( '<span class="leave-reply">' . __( 'Leave a reply', 'twentyeleven' ) . '</span>', __( '<b>1</b> Reply', 'twentyeleven' ), __( '<b>%</b> Replies', 'twentyeleven' ) ); ?></span>
		<?php endif; // End if comments_open(). ?>

		<?php edit_post_link( __( 'Edit', 'twentyeleven' ), '<span class="edit-link">', '</span>' ); ?>
	</footer><!-- .entry-meta -->
</article><!-- #post-<?php the_ID(); ?> -->