diff --git a/all-examples/php/v3/main.php b/all-examples/php/v3/main.php
index e22519c3..949a0ce1 100755
--- a/all-examples/php/v3/main.php
+++ b/all-examples/php/v3/main.php
@@ -7,9 +7,11 @@
 use Aws\Kms\KmsClient;
 use Aws\S3\Crypto\S3EncryptionClientV3;
 use Aws\Crypto\KmsMaterialsProviderV3;
+use Aws\S3\Crypto\S3EncryptionClientV2;
+use Aws\Crypto\KmsMaterialsProviderV2;
 use Aws\Exception\AwsException;
 
-function main() {
+function main(): void {
     // Check command line arguments
     if (count($GLOBALS['argv']) !== 5) {
         echo "Usage: {$GLOBALS['argv'][0]} <bucket-name> <object-key> <kms-key-id> <region>\n";
@@ -157,7 +159,350 @@ function main() {
     }
 }
 
+function testMigration(): void {
+    if (count($GLOBALS['argv']) !== 5) {
+        echo "Usage: {$GLOBALS['argv'][0]} <bucket-name> <object-key> <kms-key-id> <region>\n";
+        echo "Example: {$GLOBALS['argv'][0]} avp-21638 s3ec-php-v3 arn:aws:kms:us-east-2:648638458147:key/a47079da-17e4-45a5-b82e-2bac101cad01 us-east-2\n";
+        exit(1);
+    }
+
+    $bucketName = $GLOBALS['argv'][1];
+    $objectKey = $GLOBALS['argv'][2];
+    $kmsKeyId = $GLOBALS['argv'][3];
+    $region = $GLOBALS['argv'][4];
+
+    echo "=== S3 Encryption Client Pre-migration (V2) Example ===\n";
+    echo "Bucket: {$bucketName}\n";
+    echo "Object Key: {$objectKey}\n";
+    echo "KMS Key ID: {$kmsKeyId}\n";
+    echo "Region: {$region}\n";
+    echo "\n";
+
+    try {
+        $testData = "Hello, World! This is a test message for S3 encryption client Pre-migration (V2) in PHP.";
+        echo "Original data: {$testData}\n";
+        echo "Data length: " . strlen($testData) . " bytes\n";
+        echo "\n";
+
+        $v2EncryptionClient = new S3EncryptionClientV2(
+        new S3Client([
+            'region' => $region,
+            'version' => 'latest',
+        ])
+        );
+
+        $materialsProviderV2 = new KmsMaterialsProviderV2(
+            new KmsClient([
+                'region' => $region,
+                'version' => 'latest',
+            ]),
+            $kmsKeyId
+        );
+
+        $cipherOptions = [
+            'Cipher' => 'gcm',
+            'KeySize' => 256,
+        ];
+
+        $v2EncryptionClient->putObject([
+            '@MaterialsProvider' => $materialsProviderV2,
+            '@CipherOptions' => $cipherOptions,
+            '@KmsEncryptionContext' => ['context-key' => 'context-value'],
+            'Bucket' => $bucketName,
+            'Key' => $objectKey,
+            'Body' => $testData,
+        ]);
+
+        $getResponse = $v2EncryptionClient->getObject([
+            '@KmsAllowDecryptWithAnyCmk' => true,
+            '@SecurityProfile' => 'V2_AND_LEGACY',
+            '@CommitmentPolicy' => 'FORBID_ENCRYPT_ALLOW_DECRYPT',
+            '@MaterialsProvider' => $materialsProviderV2,
+            '@CipherOptions' => $cipherOptions,
+            'Bucket' => $bucketName,
+            'Key' => $objectKey,
+        ]);
+        
+        // Read the decrypted data
+        $decryptedData = (string) $getResponse['Body'];
+        
+        echo "Successfully downloaded and decrypted object from S3!\n";
+        echo "   Object size: " . strlen($decryptedData) . " bytes\n";
+        echo "   Decrypted data: {$decryptedData}\n";
+        echo "\n";
+
+        echo "--- Verify Roundtrip Success ---\n";
+        
+        // Verify the roundtrip was successful
+        if ($decryptedData === $testData) {
+            echo "SUCCESS: Roundtrip encryption/decryption completed successfully!\n";
+            echo "   Original data matches decrypted data\n";
+            echo "   Data integrity verified\n";
+        } else {
+            echo "ERROR: Roundtrip failed - data mismatch\n";
+            echo "   Original: {$testData}\n";
+            echo "   Decrypted: {$decryptedData}\n";
+            exit(1);
+        }
+
+        // Optionally Delete the Object
+        // echo "--- Cleanup ---\n";
+        // Clean up the test object using regular S3 client
+        // $s3Client->deleteObject([
+        //     'Bucket' => $bucketName,
+        //     'Key' => $objectKey
+        // ]);
+        // echo "Test object deleted from S3\n";
+        
+        echo "\n";
+        echo "=== Example completed successfully! ===\n";
+
+    } catch (AwsException $e) {
+        $errorCode = $e->getAwsErrorCode();
+        $errorMessage = $e->getMessage();
+        
+        if (strpos($errorCode, 'NoSuchBucket') !== false) {
+            echo "Error: S3 bucket '{$bucketName}' does not exist or is not accessible\n";
+            echo "   {$errorMessage}\n";
+        } elseif (strpos($errorCode, 'NotFoundException') !== false) {
+            echo "Error: KMS key '{$kmsKeyId}' not found or not accessible\n";
+            echo "   {$errorMessage}\n";
+        } elseif (strpos($errorMessage, 'encryption') !== false) {
+            echo "S3 Encryption Error: {$errorMessage}\n";
+        } else {
+            echo "AWS Service Error: {$errorMessage}\n";
+            echo "   Error Code: {$errorCode}\n";
+        }
+        exit(1);
+    } catch (Exception $e) {
+        echo "Unexpected error: {$e->getMessage()}\n";
+        echo "   File: {$e->getFile()}:{$e->getLine()}\n";
+        exit(1);
+    }
+    
+    echo "=== S3 Encryption Client during migration (V3 with backward compatibility) Example ===\n";
+    echo "Bucket: {$bucketName}\n";
+    echo "Object Key: {$objectKey}\n";
+    echo "KMS Key ID: {$kmsKeyId}\n";
+    echo "Region: {$region}\n";
+    echo "\n";
+
+    try {
+        $testData = "Hello, World! This is a test message for S3 encryption client during migration (V3 with backward compatibility) in PHP.";
+        echo "Original data: {$testData}\n";
+        echo "Data length: " . strlen($testData) . " bytes\n";
+        echo "\n";
+        
+        $v3EncryptionClient = new S3EncryptionClientV3(
+            new S3Client([
+                'region' => $region,
+                'version' => 'latest',
+            ])
+        );
+
+        $materialsProviderV3 = new KmsMaterialsProviderV3(
+            new KmsClient([
+                'region' => $region,
+                'version' => 'latest',
+            ]),
+            $kmsKeyId
+        );
+
+        $cipherOptions = [
+            'Cipher' => 'gcm',
+            'KeySize' => 256,
+        ];
+
+        $v3EncryptionClient->putObject([
+            '@MaterialsProvider' => $materialsProviderV3,
+            '@CipherOptions' => $cipherOptions,
+            '@CommitmentPolicy' => 'REQUIRE_ENCRYPT_ALLOW_DECRYPT',
+            '@KmsEncryptionContext' => ['context-key' => 'context-value'],
+            'Bucket' => $bucketName,
+            'Key' => $objectKey,
+            'Body' => $testData,
+        ]);
+
+        $getResponse = $v3EncryptionClient->getObject([
+            '@KmsAllowDecryptWithAnyCmk' => true,
+            '@SecurityProfile' => 'V3_AND_LEGACY',
+            '@CommitmentPolicy' => 'REQUIRE_ENCRYPT_ALLOW_DECRYPT',
+            '@MaterialsProvider' => $materialsProviderV3,
+            '@CipherOptions' => $cipherOptions,
+            'Bucket' => $bucketName,
+            'Key' => $objectKey,
+        ]);
+        
+        // Read the decrypted data
+        $decryptedData = (string) $getResponse['Body'];
+        
+        echo "Successfully downloaded and decrypted object from S3!\n";
+        echo "   Object size: " . strlen($decryptedData) . " bytes\n";
+        echo "   Decrypted data: {$decryptedData}\n";
+        echo "\n";
+
+        echo "--- Verify Roundtrip Success ---\n";
+        
+        // Verify the roundtrip was successful
+        if ($decryptedData === $testData) {
+            echo "SUCCESS: Roundtrip encryption/decryption completed successfully!\n";
+            echo "   Original data matches decrypted data\n";
+            echo "   Data integrity verified\n";
+        } else {
+            echo "ERROR: Roundtrip failed - data mismatch\n";
+            echo "   Original: {$testData}\n";
+            echo "   Decrypted: {$decryptedData}\n";
+            exit(1);
+        }
+
+        // Optionally Delete the Object
+        // echo "--- Cleanup ---\n";
+        // Clean up the test object using regular S3 client
+        // $s3Client->deleteObject([
+        //     'Bucket' => $bucketName,
+        //     'Key' => $objectKey
+        // ]);
+        // echo "Test object deleted from S3\n";
+        
+        echo "\n";
+        echo "=== Example completed successfully! ===\n";
+
+    } catch (AwsException $e) {
+        $errorCode = $e->getAwsErrorCode();
+        $errorMessage = $e->getMessage();
+        
+        if (strpos($errorCode, 'NoSuchBucket') !== false) {
+            echo "Error: S3 bucket '{$bucketName}' does not exist or is not accessible\n";
+            echo "   {$errorMessage}\n";
+        } elseif (strpos($errorCode, 'NotFoundException') !== false) {
+            echo "Error: KMS key '{$kmsKeyId}' not found or not accessible\n";
+            echo "   {$errorMessage}\n";
+        } elseif (strpos($errorMessage, 'encryption') !== false) {
+            echo "S3 Encryption Error: {$errorMessage}\n";
+        } else {
+            echo "AWS Service Error: {$errorMessage}\n";
+            echo "   Error Code: {$errorCode}\n";
+        }
+        exit(1);
+    } catch (Exception $e) {
+        echo "Unexpected error: {$e->getMessage()}\n";
+        echo "   File: {$e->getFile()}:{$e->getLine()}\n";
+        exit(1);
+    }
+    
+    echo "=== S3 Encryption Client post-migration (V3 with key commitment) Example ===\n";
+    echo "Bucket: {$bucketName}\n";
+    echo "Object Key: {$objectKey}\n";
+    echo "KMS Key ID: {$kmsKeyId}\n";
+    echo "Region: {$region}\n";
+    echo "\n";
+
+    try {
+        $testData = "Hello, World! This is a test message for S3 encryption client post-migration (V3 with key commitment) in PHP.";
+        echo "Original data: {$testData}\n";
+        echo "Data length: " . strlen($testData) . " bytes\n";
+        echo "\n";
+        
+        $v3EncryptionClient = new S3EncryptionClientV3(
+            new S3Client([
+                'region' => $region,
+                'version' => 'latest',
+            ])
+        );
+
+        $materialsProviderV3 = new KmsMaterialsProviderV3(
+            new KmsClient([
+                'region' => $region,
+                'version' => 'latest',
+            ]),
+            $kmsKeyId
+        );
+
+        $cipherOptions = [
+            'Cipher' => 'gcm',
+            'KeySize' => 256,
+        ];
+
+        $v3EncryptionClient->putObject([
+            '@MaterialsProvider' => $materialsProviderV3,
+            '@CipherOptions' => $cipherOptions,
+            '@CommitmentPolicy' => 'REQUIRE_ENCRYPT_REQUIRE_DECRYPT',
+            '@KmsEncryptionContext' => ['context-key' => 'context-value'],
+            'Bucket' => $bucketName,
+            'Key' => $objectKey,
+            'Body' => $testData,
+        ]);
+
+        $getResponse = $v3EncryptionClient->getObject([
+            '@KmsAllowDecryptWithAnyCmk' => true,
+            '@SecurityProfile' => 'V3',
+            '@CommitmentPolicy' => 'REQUIRE_ENCRYPT_REQUIRE_DECRYPT',
+            '@MaterialsProvider' => $materialsProviderV3,
+            '@CipherOptions' => $cipherOptions,
+            'Bucket' => $bucketName,
+            'Key' => $objectKey,
+        ]);
+        
+        // Read the decrypted data
+        $decryptedData = (string) $getResponse['Body'];
+        
+        echo "Successfully downloaded and decrypted object from S3!\n";
+        echo "   Object size: " . strlen($decryptedData) . " bytes\n";
+        echo "   Decrypted data: {$decryptedData}\n";
+        echo "\n";
+
+        echo "--- Verify Roundtrip Success ---\n";
+        
+        // Verify the roundtrip was successful
+        if ($decryptedData === $testData) {
+            echo "SUCCESS: Roundtrip encryption/decryption completed successfully!\n";
+            echo "   Original data matches decrypted data\n";
+            echo "   Data integrity verified\n";
+        } else {
+            echo "ERROR: Roundtrip failed - data mismatch\n";
+            echo "   Original: {$testData}\n";
+            echo "   Decrypted: {$decryptedData}\n";
+            exit(1);
+        }
+
+        // Optionally Delete the Object
+        // echo "--- Cleanup ---\n";
+        // Clean up the test object using regular S3 client
+        // $s3Client->deleteObject([
+        //     'Bucket' => $bucketName,
+        //     'Key' => $objectKey
+        // ]);
+        // echo "Test object deleted from S3\n";
+        
+        echo "\n";
+        echo "=== Example completed successfully! ===\n";
+
+    } catch (AwsException $e) {
+        $errorCode = $e->getAwsErrorCode();
+        $errorMessage = $e->getMessage();
+        
+        if (strpos($errorCode, 'NoSuchBucket') !== false) {
+            echo "Error: S3 bucket '{$bucketName}' does not exist or is not accessible\n";
+            echo "   {$errorMessage}\n";
+        } elseif (strpos($errorCode, 'NotFoundException') !== false) {
+            echo "Error: KMS key '{$kmsKeyId}' not found or not accessible\n";
+            echo "   {$errorMessage}\n";
+        } elseif (strpos($errorMessage, 'encryption') !== false) {
+            echo "S3 Encryption Error: {$errorMessage}\n";
+        } else {
+            echo "AWS Service Error: {$errorMessage}\n";
+            echo "   Error Code: {$errorCode}\n";
+        }
+        exit(1);
+    } catch (Exception $e) {
+        echo "Unexpected error: {$e->getMessage()}\n";
+        echo "   File: {$e->getFile()}:{$e->getLine()}\n";
+        exit(1);
+    }
+}
+
 // Run the main function if this script is executed directly
 if (php_sapi_name() === 'cli' && isset($GLOBALS['argv']) && basename($GLOBALS['argv'][0]) === basename(__FILE__)) {
     main();
+    testMigration();
 }