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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 |
|---|---|
| 4629 | } else { |
| 4630 | |
| 4631 | /** |
| 4632 | * Fires once an attachment has been added. |
| 4633 | * |
| 4634 | * @since 2.0.0 |
| 4635 | * |
| 4636 | * @param int $post_id Attachment ID. |
| 4637 | */ |
| 4638 | do_action( 'add_attachment', $post_id ); |
| 4639 | } |
| 4640 | |
| 4641 | return $post_id; |
| 4642 | } |
| 4643 | |
| 4644 | if ( $update ) { |
| 4645 | /** |
| 4646 | * Fires once an existing post has been updated. |
| 4647 | * |