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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 |
|---|---|
| 2397 | |
| 2398 | wp_set_post_categories($post_ID, $post_category); |
| 2399 | |
| 2400 | if ( $file ) |
| 2401 | update_attached_file( $post_ID, $file ); |
| 2402 | |
| 2403 | clean_post_cache($post_ID); |
| 2404 | |
| 2405 | if ( $update) { |
| 2406 | do_action('edit_attachment', $post_ID); |
| 2407 | } else { |
| 2408 | do_action('add_attachment', $post_ID); |
| 2409 | } |
| 2410 | |
| 2411 | return $post_ID; |
| 2412 | } |
| 2413 | |
| 2414 | /** |
| 2415 | * Delete an attachment. |