Webmozart\Json\Migration\MigrationManager::down PHP Метод

    private function down($data, $sourceVersion, $targetVersion)
    {
        while (version_compare($sourceVersion, $targetVersion, '>')) {
            if (!isset($this->migrationsByTargetVersion[$sourceVersion])) {
                throw new MigrationFailedException(sprintf('No migration found to downgrade from version %s to %s.', $sourceVersion, $targetVersion));
            }
            $migration = $this->migrationsByTargetVersion[$sourceVersion];
            // Final version too low
            if (version_compare($migration->getSourceVersion(), $targetVersion, '<')) {
                throw new MigrationFailedException(sprintf('No migration found to downgrade from version %s to %s.', $sourceVersion, $targetVersion));
            }
            $migration->down($data);
            $this->versioner->updateVersion($data, $migration->getSourceVersion());
            $sourceVersion = $migration->getSourceVersion();
        }
    }