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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 |
|---|---|
| 3401 | if ( $file ) |
| 3402 | update_attached_file( $post_ID, $file ); |
| 3403 | |
| 3404 | clean_post_cache($post_ID); |
| 3405 | |
| 3406 | if ( isset($post_parent) && $post_parent < 0 ) |
| 3407 | add_post_meta($post_ID, '_wp_attachment_temp_parent', $post_parent, true); |
| 3408 | |
| 3409 | if ( $update) { |
| 3410 | do_action('edit_attachment', $post_ID); |
| 3411 | } else { |
| 3412 | do_action('add_attachment', $post_ID); |
| 3413 | } |
| 3414 | |
| 3415 | return $post_ID; |
| 3416 | } |
| 3417 | |
| 3418 | /** |
| 3419 | * Trashes or deletes an attachment. |