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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 |
---|---|
3368 | if ( $update ) { |
3369 | /** |
3370 | * Fires immediately before an existing post is updated in the database. |
3371 | * |
3372 | * @since 2.5.0 |
3373 | * |
3374 | * @param int $post_ID Post ID. |
3375 | * @param array $data Array of unslashed post data. |
3376 | */ |
3377 | do_action( 'pre_post_update', $post_ID, $data ); |
3378 | if ( false === $wpdb->update( $wpdb->posts, $data, $where ) ) { |
3379 | if ( $wp_error ) { |
3380 | return new WP_Error('db_update_error', __('Could not update post in the database'), $wpdb->last_error); |
3381 | } else { |
3382 | return 0; |
3383 | } |
3384 | } |
3385 | } else { |
3386 | // If there is a suggested ID, use it if not already present. |