Error in PutObjectTagging AWS PHP SDK 3.0

Question

Seems to be an issue with the s3 PutObjectTagging() function in the PHP SDK 3.0.

The documentation example is:
```
$result = $client->putObjectTagging([
    'Bucket' => '', // REQUIRED
    'ChecksumAlgorithm' => 'CRC32|CRC32C|SHA1|SHA256',
    'ContentMD5' => '',
    'ExpectedBucketOwner' => '',
    'Key' => '', // REQUIRED
    'RequestPayer' => 'requester',
    'Tagging' => [ // REQUIRED
        'TagSet' => [ // REQUIRED
            [
                'Key' => '', // REQUIRED
                'Value' => '', // REQUIRED
            ],
            // ...
        ],
    ],
    'VersionId' => '',
]);
```
but when I call it in my application like this:

```
 $result = $s3Client->PutObjectTagging([ 'Bucket' => $launch_bucket,
                                                    'Key' => $zipfilename,
                                                    'Tagging' => [
                                                        'TagSet' => [
                                                            'Key' => 'wizard',
                                                            'Value' => '1'
                                                        ]
                                                    ]
                                                ]);
```

I get the rather bizarre error:
```
Found 2 errors while validating the input provided for the PutObjectTagging operation: 
[Tagging][TagSet][Key] must be an associative array. Found string(6) "wizard" 
[Tagging][TagSet][Value] must be an associative array. Found string(1) "1"
```
According to the documentation (https://docs.aws.amazon.com/aws-sdk-php/v3/api/api-s3-2006-03-01.html#putobjecttagging) the Key and Value fields must be strings, not associative arrays ...

Unless I'm missing something really obvious ...

David

Accepted Answer

Ahh!!! That's it ... TagSet is an array of arrays inside an array inside an array 🙄 I must have gone code blind after staring at it for so long 😂

Answer

Hello.

I tried running the code below in my environment, but no error occurred.  
```
 'ap-northeast-1',
    'version' => '2006-03-01'
]);

$result = $s3Client->putObjectTagging([
    'Bucket' => 'S3-Bucket-Name', // REQUIRED
    'Key' => 'test.yml', // REQUIRED
    'Tagging' => [ // REQUIRED
        'TagSet' => [ // REQUIRED
            [
                'Key' => 'wizard', // REQUIRED
                'Value' => '1' // REQUIRED
            ]
        ]
    ]
]);
```

I think you will be successful if your code is as below.  
Try modifying it to the following code.  
```
$result = $s3Client->PutObjectTagging([ 'Bucket' => $launch_bucket,
                                                    'Key' => $zipfilename,
                                                    'Tagging' => [
                                                        'TagSet' => [
                                                            [
                                                                'Key' => 'wizard',
                                                                'Value' => '1'
                                                            ]
                                                        ]
                                                    ]
                                                ]);
```

Error in PutObjectTagging AWS PHP SDK 3.0

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