Source Reference:

• Component: bbPress :: bbp-user

  File: /bbp-includes/bbp-user-functions.php :: Trac Source Line: 928

  	global $wpdb;
  
  	if ( $bbp_total_users = wp_cache_get( 'bbp_total_users', 'bbpress' ) )
  		return $bbp_total_users;
  
  	$bbp_total_users = $wpdb->get_var( "SELECT COUNT(ID) FROM {$wpdb->users} USE INDEX (PRIMARY);" );
  
  	wp_cache_set( 'bbp_total_users', $bbp_total_users, 'bbpress' );
  
  	return apply_filters( 'bbp_get_total_users', (int) $bbp_total_users );
  }
  
  /** User Status ***************************************************************/
  
  /**
   * Checks if the user has been marked as a spammer.
   *
   * @since bbPress (r3355)
   *
   * @param int $user_id int The ID for the user.