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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 |
|---|---|
| 3730 | if ( isset($post_parent) && $post_parent < 0 ) |
| 3731 | add_post_meta($post_ID, '_wp_attachment_temp_parent', $post_parent, true); |
| 3732 | |
| 3733 | if ( ! empty( $context ) ) |
| 3734 | add_post_meta( $post_ID, '_wp_attachment_context', $context, true ); |
| 3735 | |
| 3736 | if ( $update) { |
| 3737 | do_action('edit_attachment', $post_ID); |
| 3738 | } else { |
| 3739 | do_action('add_attachment', $post_ID); |
| 3740 | } |
| 3741 | |
| 3742 | return $post_ID; |
| 3743 | } |
| 3744 | |
| 3745 | /** |
| 3746 | * Trashes or deletes an attachment. |
| 3747 | * |
| 3748 | * When an attachment is permanently deleted, the file will also be removed. |