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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 |
|---|---|
| 389 | * Filter the image attachment size to use. |
| 390 | * |
| 391 | * @since Twenty thirteen 1.0 |
| 392 | * |
| 393 | * @param array $size { |
| 394 | * @type int The attachment height in pixels. |
| 395 | * @type int The attachment width in pixels. |
| 396 | * } |
| 397 | */ |
| 398 | $attachment_size = apply_filters( 'twentythirteen_attachment_size', array( 724, 724 ) ); |
| 399 | $next_attachment_url = wp_get_attachment_url(); |
| 400 | $post = get_post(); |
| 401 | |
| 402 | /* |
| 403 | * Grab the IDs of all the image attachments in a gallery so we can get the URL |
| 404 | * of the next adjacent image in a gallery, or the first image (if we're |
| 405 | * looking at the last image in a gallery), or, in a gallery of one, just the |
| 406 | * link to that image file. |
| 407 | */ |