chore: Add return types and signature arguments for spanner samples. (#1702)

* Add return types and signature arguments for spanner samples, Add signature for list_databases sample

Co-authored-by: Vishwaraj Anand <vishwaraj.anand00@gmail.com>

Author: ajupazhamayil

spanner/src/add_column.php

@@ -36,7 +36,7 @@
  * @param string $instanceId The Spanner instance ID.
  * @param string $databaseId The Spanner database ID.
  */
-function add_column($instanceId, $databaseId)
+function add_column(string $instanceId, string $databaseId): void
 {
     $spanner = new SpannerClient();
     $instance = $spanner->instance($instanceId);

spanner/src/add_json_column.php

@@ -36,7 +36,7 @@
  * @param string $instanceId The Spanner instance ID.
  * @param string $databaseId The Spanner database ID.
  */
-function add_json_column($instanceId, $databaseId)
+function add_json_column(string $instanceId, string $databaseId): void
 {
     $spanner = new SpannerClient();
     $instance = $spanner->instance($instanceId);

spanner/src/add_numeric_column.php

@@ -36,7 +36,7 @@
  * @param string $instanceId The Spanner instance ID.
  * @param string $databaseId The Spanner database ID.
  */
-function add_numeric_column($instanceId, $databaseId)
+function add_numeric_column(string $instanceId, string $databaseId): void
 {
     $spanner = new SpannerClient();
     $instance = $spanner->instance($instanceId);

spanner/src/add_timestamp_column.php

@@ -36,7 +36,7 @@
  * @param string $instanceId The Spanner instance ID.
  * @param string $databaseId The Spanner database ID.
  */
-function add_timestamp_column($instanceId, $databaseId)
+function add_timestamp_column(string $instanceId, string $databaseId): void
 {
     $spanner = new SpannerClient();
     $instance = $spanner->instance($instanceId);

spanner/src/batch_query_data.php

@@ -36,7 +36,7 @@
  * @param string $instanceId The Spanner instance ID.
  * @param string $databaseId The Spanner database ID.
  */
-function batch_query_data($instanceId, $databaseId)
+function batch_query_data(string $instanceId, string $databaseId): void
 {
     $spanner = new SpannerClient();
     $batch = $spanner->batch($instanceId, $databaseId);

spanner/src/cancel_backup.php

@@ -36,7 +36,7 @@
  * @param string $instanceId The Spanner instance ID.
  * @param string $databaseId The Spanner database ID.
  */
-function cancel_backup($instanceId, $databaseId)
+function cancel_backup(string $instanceId, string $databaseId): void
 {
     $spanner = new SpannerClient();
     $instance = $spanner->instance($instanceId);

spanner/src/copy_backup.php

@@ -39,7 +39,7 @@
  * @param string $sourceInstanceId The Spanner instance ID of the source backup.
  * @param string $sourceBackupId The Spanner backup ID of the source.
  */
-function copy_backup($destInstanceId, $destBackupId, $sourceInstanceId, $sourceBackupId)
+function copy_backup(string $destInstanceId, string $destBackupId, string $sourceInstanceId, string $sourceBackupId): void
 {
     $spanner = new SpannerClient();
 

spanner/src/create_backup.php

@@ -39,7 +39,7 @@
  * @param string $backupId The Spanner backup ID.
  * @param string $versionTime The version of the database to backup.
  */
-function create_backup($instanceId, $databaseId, $backupId, $versionTime)
+function create_backup(string $instanceId, string $databaseId, string $backupId, string $versionTime): void
 {
     $spanner = new SpannerClient();
     $instance = $spanner->instance($instanceId);

spanner/src/create_backup_with_encryption_key.php

@@ -40,7 +40,7 @@
  * @param string $backupId The Spanner backup ID.
  * @param string $kmsKeyName The KMS key used for encryption.
  */
-function create_backup_with_encryption_key($instanceId, $databaseId, $backupId, $kmsKeyName)
+function create_backup_with_encryption_key(string $instanceId, string $databaseId, string $backupId, string $kmsKeyName): void
 {
     $spanner = new SpannerClient();
     $instance = $spanner->instance($instanceId);

spanner/src/create_client_with_query_options.php

@@ -37,7 +37,7 @@
  * @param string $instanceId The Spanner instance ID.
  * @param string $databaseId The Spanner database ID.
  */
-function create_client_with_query_options($instanceId, $databaseId)
+function create_client_with_query_options(string $instanceId, string $databaseId): void
 {
     $spanner = new SpannerClient([
         'queryOptions' => [