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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 |
|---|---|
| 4732 | /** |
| 4733 | * Fires once an existing attachment has been updated. |
| 4734 | * |
| 4735 | * @since 4.4.0 |
| 4736 | * |
| 4737 | * @param int $post_id Post ID. |
| 4738 | * @param WP_Post $post_after Post object following the update. |
| 4739 | * @param WP_Post $post_before Post object before the update. |
| 4740 | */ |
| 4741 | do_action( 'attachment_updated', $post_id, $post_after, $post_before ); |
| 4742 | } else { |
| 4743 | |
| 4744 | /** |
| 4745 | * Fires once an attachment has been added. |
| 4746 | * |
| 4747 | * @since 2.0.0 |
| 4748 | * |
| 4749 | * @param int $post_id Attachment ID. |
| 4750 | */ |