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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 |
|---|---|
| 5098 | /** |
| 5099 | * Fires once an existing attachment has been updated. |
| 5100 | * |
| 5101 | * @since 4.4.0 |
| 5102 | * |
| 5103 | * @param int $post_id Post ID. |
| 5104 | * @param WP_Post $post_after Post object following the update. |
| 5105 | * @param WP_Post $post_before Post object before the update. |
| 5106 | */ |
| 5107 | do_action( 'attachment_updated', $post_id, $post_after, $post_before ); |
| 5108 | } else { |
| 5109 | |
| 5110 | /** |
| 5111 | * Fires once an attachment has been added. |
| 5112 | * |
| 5113 | * @since 2.0.0 |
| 5114 | * |
| 5115 | * @param int $post_id Attachment ID. |
| 5116 | */ |