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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 | 
|---|---|
| 401 |       * Filter the image attachment size to use. | 
| 402 |       * | 
| 403 |       * @since Twenty thirteen 1.0 | 
| 404 |       * | 
| 405 |       * @param array $size { | 
| 406 |       *     @type int The attachment height in pixels. | 
| 407 |       *     @type int The attachment width in pixels. | 
| 408 |       * } | 
| 409 |       */ | 
| 410 |      $attachment_size     = apply_filters( 'twentythirteen_attachment_size', array( 724, 724 ) ); | 
| 411 |      $next_attachment_url = wp_get_attachment_url(); | 
| 412 |      $post                = get_post(); | 
| 413 |  | 
| 414 |      /* | 
| 415 |       * Grab the IDs of all the image attachments in a gallery so we can get the URL | 
| 416 |       * of the next adjacent image in a gallery, or the first image (if we're | 
| 417 |       * looking at the last image in a gallery), or, in a gallery of one, just the | 
| 418 |       * link to that image file. | 
| 419 |       */ |