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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 |
|---|---|
| 81 | // or get the URL of the first image attachment |
| 82 | $next_attachment_url = get_attachment_link( $attachments[ 0 ]->ID ); |
| 83 | } else { |
| 84 | // or, if there's only 1 image attachment, get the URL of the image |
| 85 | $next_attachment_url = wp_get_attachment_url(); |
| 86 | } |
| 87 | ?> |
| 88 | <p class="attachment"><a href="<?php echo $next_attachment_url; ?>" title="<?php the_title_attribute(); ?>" rel="attachment"><?php |
| 89 | $attachment_width = apply_filters( 'twentyten_attachment_size', 900 ); |
| 90 | $attachment_height = apply_filters( 'twentyten_attachment_height', 900 ); |
| 91 | echo wp_get_attachment_image( $post->ID, array( $attachment_width, $attachment_height ) ); // filterable image width with, essentially, no limit for image height. |
| 92 | ?></a></p> |
| 93 | |
| 94 | <div id="nav-below" class="navigation"> |
| 95 | <div class="nav-previous"><?php previous_image_link( false ); ?></div> |
| 96 | <div class="nav-next"><?php next_image_link( false ); ?></div> |
| 97 | </div><!-- #nav-below --> |
| 98 | <?php else : ?> |
| 99 | <a href="<?php echo wp_get_attachment_url(); ?>" title="<?php the_title_attribute(); ?>" rel="attachment"><?php echo basename( get_permalink() ); ?></a> |