Reply To: Breadcrumbs -> add root site before 'home'

I’ve never played around with a network install so I cant test it for you. But if I add something ridiculous like

function wpse_104094_breadcrumb_trail_args( $args ) {
    $args['before'] = 'Yo';
    $args['network'] = true;
    return $args;
}

add_filter( 'breadcrumb_trail_args', 'wpse_104094_breadcrumb_trail_args' );

I also put a default value in ‘before’ and it used Yo instead of my default value. So, it is filtering the defaults.

You can see by adding this below the apply_filters statement.

print_r($this->args);