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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 |
|---|---|
| 4467 | if ( $update ) { |
| 4468 | /** |
| 4469 | * Fires immediately before an existing post is updated in the database. |
| 4470 | * |
| 4471 | * @since 2.5.0 |
| 4472 | * |
| 4473 | * @param int $post_id Post ID. |
| 4474 | * @param array $data Array of unslashed post data. |
| 4475 | */ |
| 4476 | do_action( 'pre_post_update', $post_id, $data ); |
| 4477 | |
| 4478 | if ( false === $wpdb->update( $wpdb->posts, $data, $where ) ) { |
| 4479 | if ( $wp_error ) { |
| 4480 | if ( 'attachment' === $post_type ) { |
| 4481 | $message = __( 'Could not update attachment in the database.' ); |
| 4482 | } else { |
| 4483 | $message = __( 'Could not update post in the database.' ); |
| 4484 | } |
| 4485 | |