PHP

wordpress check user against user roles

$user = wp_get_current_user();
if ( in_array( 'author', (array) $user->roles ) ) {
    //The user has the "author" role
}

get users by role wordpress

$getDealers = get_users( 
					array(
						'role'         => 'dealership',
						'orderby'      => 'nickname'
					)
				);
				
				if($getDealers) {			
					foreach($getDealers as $getDealer) {
						if($getDealer->ID == $new_user_data->dealer){
							update_user_meta($new_user_id, 'yews_data_dealership_name', $getDealer->nickname);
						}
					}
				}