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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 |
|---|---|
| 3528 | if ( $update ) { |
| 3529 | /** |
| 3530 | * Fires immediately before an existing post is updated in the database. |
| 3531 | * |
| 3532 | * @since 2.5.0 |
| 3533 | * |
| 3534 | * @param int $post_ID Post ID. |
| 3535 | * @param array $data Array of unslashed post data. |
| 3536 | */ |
| 3537 | do_action( 'pre_post_update', $post_ID, $data ); |
| 3538 | if ( false === $wpdb->update( $wpdb->posts, $data, $where ) ) { |
| 3539 | if ( $wp_error ) { |
| 3540 | return new WP_Error('db_update_error', __('Could not update post in the database'), $wpdb->last_error); |
| 3541 | } else { |
| 3542 | return 0; |
| 3543 | } |
| 3544 | } |
| 3545 | } else { |
| 3546 | // If there is a suggested ID, use it if not already present. |