Google\Cloud\Datastore\Operation::commit PHP Method

    public function commit(array $mutations, array $options = [])
    {
        $options += ['transaction' => null];
        $res = $this->connection->commit($options + ['mode' => $options['transaction'] ? 'TRANSACTIONAL' : 'NON_TRANSACTIONAL', 'mutations' => $mutations, 'projectId' => $this->projectId]);
        return $res;
    }

 /**
  * Delete multiple entities
  *
  * Deletion by this method is non-transactional. If you need transaction
  * support, use {@see Google\Cloud\Datastore\Transaction::deleteBatch()}.
  *
  * Example:
  * ```
  * $keys = [
  *     $datastore->key('Person', 'Bob'),
  *     $datastore->key('Person', 'John')
  * ];
  *
  * $datastore->deleteBatch($keys);
  * ```
  *
  * @param Key[] $keys The identifiers to delete.
  * @param array $options [optional] {
  *     Configuration options
  *
  *     @type string $baseVersion Provides concurrency control. The version
  *           of the entity that this mutation is being applied to. If this
  *           does not match the current version on the server, the mutation
  *           conflicts.
  * }
  * @return array [Response Body](https://cloud.google.com/datastore/reference/rest/v1/projects/commit#response-body)
  */
 public function deleteBatch(array $keys, array $options = [])
 {
     $options += ['baseVersion' => null];
     $mutations = [];
     foreach ($keys as $key) {
         $mutations[] = $this->operation->mutation('delete', $key, Key::class, $options['baseVersion']);
     }
     return $this->operation->commit($mutations, $options);
 }