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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 |
|---|---|
| 3337 | /** |
| 3338 | * Fires once an existing attachment has been updated. |
| 3339 | * |
| 3340 | * @since 4.4.0 |
| 3341 | * |
| 3342 | * @param int $post_ID Post ID. |
| 3343 | * @param WP_Post $post_after Post object following the update. |
| 3344 | * @param WP_Post $post_before Post object before the update. |
| 3345 | */ |
| 3346 | do_action( 'attachment_updated', $post_ID, $post_after, $post_before ); |
| 3347 | } else { |
| 3348 | |
| 3349 | /** |
| 3350 | * Fires once an attachment has been added. |
| 3351 | * |
| 3352 | * @since 2.0.0 |
| 3353 | * |
| 3354 | * @param int $post_ID Attachment ID. |
| 3355 | */ |