bbp_admin_repair_user_roles()

function bbp_admin_repair_user_roles() {

	$statement    = __( 'Remapping forum role for each user on this site… %s', 'buddyboss' );
	$changed      = 0;
	$role_map     = bbp_get_user_role_map();
	$default_role = bbp_get_default_role();

	// Bail if no role map exists
	if ( empty( $role_map ) )
		return array( 1, sprintf( $statement, __( 'Failed!', 'buddyboss' ) ) );

	// Iterate through each role...
	foreach ( array_keys( bbp_get_blog_roles() ) as $role ) {

		// Reset the offset
		$offset = 0;

		// If no role map exists, give the default forum role (bbp-participant)
		$new_role = isset( $role_map[$role] ) ? $role_map[$role] : $default_role;

		// Get users of this site, limited to 1000
		while ( $users = get_users( array(
				'role'   => $role,
				'fields' => 'ID',
				'number' => 1000,
				'offset' => $offset
			) ) ) {

			// Iterate through each user of $role and try to set it
			foreach ( (array) $users as $user_id ) {
				if ( bbp_set_user_role( $user_id, $new_role ) ) {
					++$changed; // Keep a count to display at the end
				}
			}

			// Bump the offset for the next query iteration
			$offset = $offset + 1000;
		}
	}

	$result = sprintf( __( 'Complete! %s users updated.', 'buddyboss' ), bbp_number_format( $changed ) );
	return array( 0, sprintf( $statement, $result ) );
}