How to add or add a function?

Question

CMS

Help me please, there is a code for adding an object to bookmarks:

if ( ! function_exists( 'cs_addto_usermeta_carosel' ) ) :
  function cs_addto_usermeta_carosel() {
    $user = cs_get_user_id();
    if(isset($user) && $user <> ''){
      if(isset($_POST['post_id']) && $_POST['post_id'] <> ''){

        $cs_wishlist = cs_get_user_meta();
        $cs_wishlist = (isset($cs_wishlist) and is_array($cs_wishlist)) ? $cs_wishlist : array();
        if ( isset ( $cs_wishlist ) && in_array( $_POST['post_id'] , $cs_wishlist )) {
          $post_id = array();
          $post_id[] = $_POST['post_id'];
          $cs_wishlist = array_diff( $post_id , $cs_wishlist );
          cs_update_user_meta( $cs_wishlist );
          echo '<i class="icon-star-o"></i>'; 
          die();
        }

        $cs_wishlist = array();
        $cs_wishlist =  get_user_meta(cs_get_user_id(),'cs-directory-wishlist', true);
          $cs_wishlist[] = $_POST['post_id'];
          $cs_wishlist = array_unique($cs_wishlist);
          update_user_meta(cs_get_user_id(),'cs-directory-wishlist',$cs_wishlist);
          $user_watchlist = get_user_meta(cs_get_user_id(),'cs-directory-wishlist', true);

          $cs_icon = '<i class="icon-star2"></i>';
          $cs_pop_msg = '<div class="outerwrapp-layer">'.__('Added to Favourite','directory').'</div>';

          $cs_html = array(
                  'icon' => $cs_icon,
                  'msg' => $cs_pop_msg,
                 );
          $cs_json = json_encode($cs_html);
          echo $cs_json;
        }
    } else {
      _e('You have to login first.','directory');
    }
    die();  
  }
endif;

add_action("wp_ajax_cs_addto_usermeta_carosel", "cs_addto_usermeta_carosel");
add_action("wp_ajax_nopriv_cs_addto_usermeta_carosel", "cs_addto_usermeta_carosel");

The object is added to bookmarks only when the user has registered, I need this function to work only for certain roles. For example, I want to disable this feature for the subscriber role. Please help me.

Answer 1

function cs_addto_usermeta_carosel() {
$user_data = get_userdata( get_current_user_id() );
if( 'subscriber' === $user_data->roles[0] ) 
wp_die();
/** Остальной код **/
}

also this is an action, it is superfluous in your case
But in general, using user roles directly is not very convenient, it is much more convenient to use the features right away.

Answer 2

What are roles? how do you store them?