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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 |
|---|---|
| 333 | |
| 334 | wp_set_post_cats('', $post_ID, $post_category); |
| 335 | |
| 336 | if ( $file ) |
| 337 | add_post_meta($post_ID, '_wp_attached_file', $file); |
| 338 | |
| 339 | clean_post_cache($post_ID); |
| 340 | |
| 341 | if ( $update) { |
| 342 | do_action('edit_attachment', $post_ID); |
| 343 | } else { |
| 344 | do_action('add_attachment', $post_ID); |
| 345 | } |
| 346 | |
| 347 | return $post_ID; |
| 348 | } |
| 349 | |
| 350 | function wp_delete_attachment($postid) { |
| 351 | global $wpdb; |