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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 |
|---|---|
| 4795 | /** |
| 4796 | * Fires once an existing attachment has been updated. |
| 4797 | * |
| 4798 | * @since 4.4.0 |
| 4799 | * |
| 4800 | * @param int $post_id Post ID. |
| 4801 | * @param WP_Post $post_after Post object following the update. |
| 4802 | * @param WP_Post $post_before Post object before the update. |
| 4803 | */ |
| 4804 | do_action( 'attachment_updated', $post_id, $post_after, $post_before ); |
| 4805 | } else { |
| 4806 | |
| 4807 | /** |
| 4808 | * Fires once an attachment has been added. |
| 4809 | * |
| 4810 | * @since 2.0.0 |
| 4811 | * |
| 4812 | * @param int $post_id Attachment ID. |
| 4813 | */ |