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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 |
|---|---|
| 4382 | /** |
| 4383 | * Fires once an existing attachment has been updated. |
| 4384 | * |
| 4385 | * @since 4.4.0 |
| 4386 | * |
| 4387 | * @param int $post_ID Post ID. |
| 4388 | * @param WP_Post $post_after Post object following the update. |
| 4389 | * @param WP_Post $post_before Post object before the update. |
| 4390 | */ |
| 4391 | do_action( 'attachment_updated', $post_ID, $post_after, $post_before ); |
| 4392 | } else { |
| 4393 | |
| 4394 | /** |
| 4395 | * Fires once an attachment has been added. |
| 4396 | * |
| 4397 | * @since 2.0.0 |
| 4398 | * |
| 4399 | * @param int $post_ID Attachment ID. |
| 4400 | */ |