function bbp_admin_repair_user_roles() {

	$statement    = esc_html__( 'Remapping forum role for each user on this site… %s', 'bbpress' );
	$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, esc_html__( 'Failed!', 'bbpress' ) ) );
	}

	// Get non-forum roles
	$blog_roles = array_keys( bbp_get_blog_roles() );

	// Iterate through each role...
	foreach ( $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;
		}
	}

	// Reset the offset
	$offset  = 0;
	$bbp_db  = bbp_db();
	$cap_key = $bbp_db->get_blog_prefix() . 'capabilities';

	// Users without roles should be granted the default role, but not on multi-
	// site installations where not all users get a role by default.
	if ( ! is_multisite() ) {

		// Get users with missing capabilities on this site, limited to 1000
		while ( $users = get_users( array(
			'meta_key'     => $cap_key,
			'meta_compare' => 'NOT EXISTS',
			'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, $default_role ) ) {
					++$changed; // Keep a count to display at the end
				}
			}

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

	// On multisite, we'll look for users with an empty capabilities array.
	// These are users who basically have malformed caps, and we can fix that.
	} else {

		// Get users with empty capabilities on this site, limited to 1000
		while ( $users = get_users( array(
			'meta_key'   => $cap_key,
			'meta_value' => 'a:0:{}',
			'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, $default_role ) ) {
					++$changed; // Keep a count to display at the end
				}
			}

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

	$result = sprintf( esc_html__( 'Complete! %s users updated.', 'bbpress' ), bbp_number_format( $changed ) );

	return array( 0, sprintf( $statement, $result ) );
}