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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 |
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384 | /** |
385 | * Prints the attached image with a link to the next attached image. |
386 | * |
387 | * @since Twenty Thirteen 1.0 |
388 | * |
389 | * @return void |
390 | */ |
391 | function twentythirteen_the_attached_image() { |
392 | $post = get_post(); |
393 | $attachment_size = apply_filters( 'twentythirteen_attachment_size', array( 724, 724 ) ); |
394 | $next_attachment_url = wp_get_attachment_url(); |
395 |
|
396 | /** |
397 | * Grab the IDs of all the image attachments in a gallery so we can get the URL |
398 | * of the next adjacent image in a gallery, or the first image (if we're |
399 | * looking at the last image in a gallery), or, in a gallery of one, just the |
400 | * link to that image file. |
401 | */ |
402 | $attachment_ids = get_posts( array( |