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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 |
|---|---|
| 2123 | |
| 2124 | wp_set_post_categories($post_ID, $post_category); |
| 2125 | |
| 2126 | if ( $file ) |
| 2127 | update_attached_file( $post_ID, $file ); |
| 2128 | |
| 2129 | clean_post_cache($post_ID); |
| 2130 | |
| 2131 | if ( $update) { |
| 2132 | do_action('edit_attachment', $post_ID); |
| 2133 | } else { |
| 2134 | do_action('add_attachment', $post_ID); |
| 2135 | } |
| 2136 | |
| 2137 | return $post_ID; |
| 2138 | } |
| 2139 | |
| 2140 | /** |
| 2141 | * wp_delete_attachment() - Delete an attachment |