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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 |
|---|---|
| 4674 | } else { |
| 4675 | |
| 4676 | /** |
| 4677 | * Fires once an attachment has been added. |
| 4678 | * |
| 4679 | * @since 2.0.0 |
| 4680 | * |
| 4681 | * @param int $post_id Attachment ID. |
| 4682 | */ |
| 4683 | do_action( 'add_attachment', $post_id ); |
| 4684 | } |
| 4685 | |
| 4686 | return $post_id; |
| 4687 | } |
| 4688 | |
| 4689 | if ( $update ) { |
| 4690 | /** |
| 4691 | * Fires once an existing post has been updated. |
| 4692 | * |