错误的搜索词，已找到：

function on_all_status_transitions( $new_status, $old_status, $post ) {
    if ( $new_status != $old_status ) {
        // A function to perform actions any time any post changes status.
    }
}
add_action(  \'transition_post_status\',  \'on_all_status_transitions\', 10, 3 );

https://codex.wordpress.org/Post_Status_Transitions