feat(PubSub): Add samples to create topics and subscriptions with SMT support (#2179)

Author: Hectorhammett

pubsub/api/src/create_subscription_with_smt.php

@@ -0,0 +1,70 @@
+<?php
+/**
+ * Copyright 2026 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * For instructions on how to run the full sample:
+ *
+ * @see https://github.com/GoogleCloudPlatform/php-docs-samples/blob/main/pubsub/api/README.md
+ */
+namespace Google\Cloud\Samples\PubSub;
+
+# [START pubsub_create_subscription_with_smt]
+use Google\Cloud\PubSub\PubSubClient;
+use Google\Cloud\PubSub\Topic;
+
+/**
+ * Create a topic with a Single Message Transform function
+ *
+ * @param string $projectId
+ * @param string $topicId
+ * @param string $subscriptionName
+ */
+function create_subscription_with_smt(
+    string $projectId,
+    string $topicId,
+    string $subscriptionName
+) {
+    $pubsub = new PubSubClient([
+        'projectId' => $projectId
+    ]);
+
+    $functionName = 'toUpper';
+    $code = 'function toUpper(message, metadata){
+        message.data = message.data.toUpperCase();
+        return message;
+    }';
+
+    $smtConfig = [
+        'javascriptUdf' => [
+            'functionName' => $functionName,
+            'code' => $code,
+        ]
+    ];
+
+    $subscriptionConfig = [
+        'messageTransforms' => [
+            $smtConfig
+        ]
+    ];
+
+    $subscription = $pubsub->subscribe($subscriptionName, $topicId, $subscriptionConfig);
+
+    printf('Subscription with SMT %s created', $subscription->name());
+}
+# [END pubsub_create_subscription_with_smt]
+require_once __DIR__ . '/../../../testing/sample_helpers.php';
+\Google\Cloud\Samples\execute_sample(__FILE__, __NAMESPACE__, $argv);

pubsub/api/src/create_topic_with_smt.php

@@ -0,0 +1,68 @@
+<?php
+/**
+ * Copyright 2026 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * For instructions on how to run the full sample:
+ *
+ * @see https://github.com/GoogleCloudPlatform/php-docs-samples/blob/main/pubsub/api/README.md
+ */
+namespace Google\Cloud\Samples\PubSub;
+
+# [START pubsub_create_topic_with_smt]
+use Google\Cloud\PubSub\PubSubClient;
+use Google\Cloud\PubSub\Topic;
+
+/**
+ * Create a topic with a Single Message Transform function
+ *
+ * @param string $projectId
+ * @param string $topicId
+ */
+function create_topic_with_smt(
+    string $projectId,
+    string $topicId
+) {
+    $pubsub = new PubSubClient([
+        'projectId' => $projectId
+    ]);
+
+    $functionName = 'toUpper';
+    $code = 'function toUpper(message, metadata){
+        message.data = message.data.toUpperCase();
+        return message;
+    }';
+
+    $smtConfig = [
+        'javascriptUdf' => [
+            'functionName' => $functionName,
+            'code' => $code
+        ]
+    ];
+
+    $topicConfig = [
+        'messageTransforms' => [
+            $smtConfig
+        ]
+    ];
+
+    $topic = $pubsub->createTopic($topicId, $topicConfig);
+
+    printf('Topic with SMT %s created', $topic->name());
+}
+# [END pubsub_create_topic_with_smt]
+require_once __DIR__ . '/../../../testing/sample_helpers.php';
+\Google\Cloud\Samples\execute_sample(__FILE__, __NAMESPACE__, $argv);

pubsub/api/test/pubsubTest.php

@@ -159,6 +159,26 @@ public function testCreateAndDeleteTopic()
         $this->assertMatchesRegularExpression(sprintf('/%s/', $topic), $output);
     }
 
+    public function testCreateAndDeleteTopicWithSMT()
+    {
+        $topic = 'test-topic-smt-' . rand();
+        $output = $this->runFunctionSnippet('create_topic_with_smt', [
+            self::$projectId,
+            $topic,
+        ]);
+
+        $this->assertMatchesRegularExpression('/Topic with SMT/', $output);
+        $this->assertMatchesRegularExpression(sprintf('/%s/', $topic), $output);
+
+        $output = $this->runFunctionSnippet('delete_topic', [
+            self::$projectId,
+            $topic,
+        ]);
+
+        $this->assertMatchesRegularExpression('/Topic deleted:/', $output);
+        $this->assertMatchesRegularExpression(sprintf('/%s/', $topic), $output);
+    }
+
     public function testTopicMessage()
     {
         $topic = $this->requireEnv('GOOGLE_PUBSUB_TOPIC');
@@ -234,6 +254,28 @@ public function testCreateAndDeleteSubscription()
         $this->assertMatchesRegularExpression(sprintf('/%s/', $subscription), $output);
     }
 
+    public function testCreateAndDeleteSubscriptionWithSMT()
+    {
+        $topic = $this->requireEnv('GOOGLE_PUBSUB_TOPIC');
+        $subscription = 'test-subscription-' . rand();
+        $output = $this->runFunctionSnippet('create_subscription_with_SMT', [
+            self::$projectId,
+            $topic,
+            $subscription
+        ]);
+
+        $this->assertMatchesRegularExpression('/Subscription with SMT/', $output);
+        $this->assertMatchesRegularExpression(sprintf('/%s/', $subscription), $output);
+
+        $output = $this->runFunctionSnippet('delete_subscription', [
+            self::$projectId,
+            $subscription,
+        ]);
+
+        $this->assertMatchesRegularExpression('/Subscription deleted:/', $output);
+        $this->assertMatchesRegularExpression(sprintf('/%s/', $subscription), $output);
+    }
+
     public function testCreateAndDeleteSubscriptionWithFilter()
     {
         $topic = $this->requireEnv('GOOGLE_PUBSUB_TOPIC');