how to get multiple users id from acf wordpress

I created a field with user type user with multiselect so when the admin add the post he will select multiple user so how to get multiple user id in custom post type loop here's the code i used

                $args = array(
                    'post_type' => 'offers',
                    'orderby' => 'title',
                    'order' => 'ASC'
                );
                $the_query = new WP_Query( $args );         
             if ( $the_query->have_posts() ) : while ( $the_query->have_posts() ) : $the_query->the_post(); 

echo            $variable = get_field('select_user');
             endwhile; endif; 

via Chebli Mohamed