bbp_get_user_blog_role( int $user_id )

function bbp_get_user_blog_role( $user_id = 0 ) {

	// Add Forums roles (returns $wp_roles global)
	bbp_add_forums_roles();

	// Validate user id
	$user_id = bbp_get_user_id( $user_id );
	$user    = get_userdata( $user_id );
	$role    = false;

	// User has roles so lets
	if ( ! empty( $user->roles ) ) {

		// Look for a non Forums role
		$roles     = array_intersect(
			array_values( $user->roles ),
			array_keys( bbp_get_blog_roles() )
		);

		// If there's a role in the array, use the first one. This isn't very
		// smart, but since roles aren't exactly hierarchical, and WordPress
		// does not yet have a UI for multiple user roles, it's fine for now.
		if ( !empty( $roles ) ) {
			$role = array_shift( $roles );
		}
	}

	return apply_filters( 'bbp_get_user_blog_role', $role, $user_id, $user );
}