image.php

<?php
/**
 * The template for displaying image attachments.
 *
 * @package Autonomie
 * @since Autonomie 1.0.0
 */

get_header(); ?>

			<main id="primary" <?php autonomie_main_class(); ?><?php autonomie_semantics( 'main' ); ?>>

			<?php while ( have_posts() ) : the_post(); ?>

				<article id="post-<?php the_ID(); ?>" <?php post_class(); ?>itemscope itemtype="https://schema.org/ImageObject">
					<?php get_template_part( 'template-parts/entry-header' ); ?>

					<div class="entry-content e-content" itemprop="description">

						<div class="entry-attachment">
							<figure class="attachment">
								<?php
								/**
								 * Grab the IDs of all the image attachments in a gallery so we can get the URL of the next adjacent image in a gallery,
								 * or the first image (if we're looking at the last image in a gallery), or, in a gallery of one, just the link to that image file
								 */
								$attachments = array_values( get_children( array( 'post_parent' => $post->post_parent, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => 'ASC', 'orderby' => 'menu_order ID' ) ) );
								foreach ( $attachments as $k => $attachment ) {
									if ( $attachment->ID == $post->ID ) {
										break;
									}
								}
								$k++;
								// If there is more than 1 attachment in a gallery
								if ( count( $attachments ) > 1 ) {
									if ( isset( $attachments[ $k ] ) ) {
										// get the URL of the next image attachment
										$next_attachment_url = get_attachment_link( $attachments[ $k ]->ID );
									} else {
										// or get the URL of the first image attachment
										$next_attachment_url = get_attachment_link( $attachments[0]->ID );
									}
								} else {
									// or, if there's only 1 image, get the URL of the image
									$next_attachment_url = wp_get_attachment_url();
								}
								?>

								<a href="<?php echo $next_attachment_url; ?>" title="<?php echo esc_attr( get_the_title() ); ?>" rel="attachment"><?php
								$attachment_size = apply_filters( 'autonomie_attachment_size', 1200 );
								echo wp_get_attachment_image( $post->ID, array( $attachment_size, $attachment_size ), null, array( 'itemprop' => 'image contentURL' ) ); // filterable image width with, essentially, no limit for image height.
								?></a>

								<?php if ( ! empty( $post->post_excerpt ) ) : ?>
								<figcaption class="entry-caption">
									<?php the_excerpt(); ?>
								</figcaption>
								<?php endif; ?>
							</figure><!-- .attachment -->
						</div><!-- .entry-attachment -->

						<?php the_content(); ?>
						<?php wp_link_pages( array( 'before' => '<div class="page-link">' . __( 'Pages:', 'autonomie' ), 'after' => '</div>' ) ); ?>
					</div><!-- .entry-content -->

					<?php get_template_part( 'template-parts/entry-footer' ); ?>
				</article><!-- #post-<?php the_ID(); ?> -->

				<?php comments_template(); ?>

			<?php endwhile; // end of the loop. ?>

			</main><!-- #content -->

<?php get_footer(); ?>