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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 |
|---|---|
| 3772 | if ( $file ) |
| 3773 | update_attached_file( $post_ID, $file ); |
| 3774 | |
| 3775 | clean_post_cache( $post_ID ); |
| 3776 | |
| 3777 | if ( ! empty( $context ) ) |
| 3778 | add_post_meta( $post_ID, '_wp_attachment_context', $context, true ); |
| 3779 | |
| 3780 | if ( $update) { |
| 3781 | do_action('edit_attachment', $post_ID); |
| 3782 | } else { |
| 3783 | do_action('add_attachment', $post_ID); |
| 3784 | } |
| 3785 | |
| 3786 | return $post_ID; |
| 3787 | } |
| 3788 | |
| 3789 | /** |
| 3790 | * Trashes or deletes an attachment. |