diff --git a/spanner/src/batch_write.php b/spanner/src/batch_write.php
new file mode 100644
index 0000000000..30b5267e83
--- /dev/null
+++ b/spanner/src/batch_write.php
@@ -0,0 +1,102 @@
+<?php
+/**
+ * Copyright 2026 Google Inc.
+ *
+ * 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/tree/main/spanner/README.md
+ */
+
+namespace Google\Cloud\Samples\Spanner;
+
+// [START spanner_batch_write_at_least_once]
+use Google\Cloud\Spanner\SpannerClient;
+
+/**
+ * Inserts sample data into the given database via BatchWrite API.
+ * The database and table must already exist and can be created using `create_database`.
+ *
+ * Example:
+ * ```
+ * batch_write($projectId, $instanceId, $databaseId);
+ * ```
+ *
+ * @param string $projectId The Google Cloud project ID.
+ * @param string $instanceId The Spanner instance ID.
+ * @param string $databaseId The Spanner database ID.
+ */
+function batch_write(string $projectId, string $instanceId, string $databaseId): void
+{
+    $spanner = new SpannerClient(['projectId' => $projectId]);
+    $database = $spanner->instance($instanceId)->database($databaseId);
+
+    // Create Mutation Groups
+    // All mutations within a single group are applied atomically.
+    // Mutations across groups are applied non-atomically.
+
+    // Group 1: Single mutation
+    $mutationGroup1 = $database->mutationGroup();
+    $mutationGroup1->insertOrUpdate('Singers', [
+        'SingerId' => 16,
+        'FirstName' => 'Scarlet',
+        'LastName' => 'Terry'
+    ]);
+
+    // Group 2: Multiple mutations
+    $mutationGroup2 = $database->mutationGroup();
+    $mutationGroup2->insertOrUpdateBatch('Singers', [
+        ['SingerId' => 17, 'FirstName' => 'Marc'],
+        ['SingerId' => 18, 'FirstName' => 'Catalina', 'LastName' => 'Smith']
+    ]);
+    $mutationGroup2->insertOrUpdateBatch('Albums', [
+        ['SingerId' => 17, 'AlbumId' => 1, 'AlbumTitle' => 'Total Junk'],
+        ['SingerId' => 18, 'AlbumId' => 2, 'AlbumTitle' => 'Go, Go, Go']
+    ]);
+
+    // Call batchWrite on the high-level Database client.
+    // Equivalent to batchWriteAtLeastOnce in other languages.
+    $responses = $database->batchWrite([$mutationGroup1, $mutationGroup2], [
+        'requestOptions' => ['transactionTag' => 'batch-write-tag']
+    ]);
+
+    // Check the response code of each response to determine whether the mutation group(s) were applied successfully.
+    // $responses is a Generator yielding V1\BatchWriteResponse items.
+    // Check the response code of each response to determine whether the mutation group(s) were applied successfully.
+    // $responses is a Generator yielding response arrays.
+    foreach ($responses as $response) {
+        $status = $response['status'];
+        $indexes = implode(', ', $response['indexes']);
+        if ($status['code'] === 0) {
+            $timestamp = $response['commitTimestamp'] ?? 'Unknown';
+            printf('Mutation group indexes [%s] have been applied with commit timestamp %s' . PHP_EOL,
+                $indexes,
+                $timestamp
+            );
+        } else {
+            printf('Mutation group indexes [%s] could not be applied with error code %s and error message %s' . PHP_EOL,
+                $indexes,
+                $status['code'],
+                $status['message']
+            );
+        }
+    }
+}
+// [END spanner_batch_write_at_least_once]
+
+// The following 2 lines are only needed to run the samples
+require_once __DIR__ . '/../../testing/sample_helpers.php';
+\Google\Cloud\Samples\execute_sample(__FILE__, __NAMESPACE__, $argv);
diff --git a/spanner/test/spannerTest.php b/spanner/test/spannerTest.php
index eb06bb2e9d..548042e6cc 100644
--- a/spanner/test/spannerTest.php
+++ b/spanner/test/spannerTest.php
@@ -372,6 +372,16 @@ public function testInsertData()
         $this->assertEquals('Inserted data.' . PHP_EOL, $output);
     }
 
+    /**
+     * @depends testInsertData
+     */
+    public function testBatchWrite()
+    {
+        $output = $this->runFunctionSnippet('batch_write');
+        $this->assertStringContainsString('Mutation group indexes', $output);
+        $this->assertStringContainsString('have been applied', $output);
+    }
+
     /**
      * @depends testInsertData
      */