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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code | 
|---|---|
| 66 |           else | 
| 67 |                // or get the URL of the first image attachment | 
| 68 |                $next_attachment_url = get_attachment_link( $attachments[ 0 ]->ID ); | 
| 69 |      } else { | 
| 70 |           // or, if there's only 1 image, get the URL of the image | 
| 71 |           $next_attachment_url = wp_get_attachment_url(); | 
| 72 |      } | 
| 73 | ?> | 
| 74 |                                              <a href="<?php echo esc_url( $next_attachment_url ); ?>" title="<?php the_title_attribute(); ?>" rel="attachment"><?php | 
| 75 |                                              $attachment_size = apply_filters( 'twentyeleven_attachment_size', 848 ); | 
| 76 |                                              echo wp_get_attachment_image( $post->ID, array( $attachment_size, 1024 ) ); // filterable image width with 1024px limit for image height. | 
| 77 |                                              ?></a> | 
| 78 |  | 
| 79 |                                              <?php if ( ! empty( $post->post_excerpt ) ) : ?> | 
| 80 |                                              <div class="entry-caption"> | 
| 81 |                                                   <?php the_excerpt(); ?> | 
| 82 |                                              </div> | 
| 83 |                                              <?php endif; ?> | 
| 84 |                                         </div><!-- .attachment --> |