Amazon Sqs FIFO queue
<p>I can't send message to a FIFO queue using the PHP SDK v2.7.16. </p>

<p>I get an exception: "The request must contain the parameter MessageGroupId," even though I am passing a valid <code>MessageGroupId</code> argument.</p>

<pre><code> public function sendMessage($queueUrl,$messageBody)
 {
   $this-&gt;client-&gt;sendMessage(array(
   'QueueUrl'    =&gt; $queueUrl,
   'MessageBody' =&gt; $messageBody,
   'MessageGroupId'=&gt;'messagegroupid1000',
   'MessageDeduplicationID'=&gt;'messagededuplicationid1000'));
 }
</code></pre>

<p>Whats wrong?</p>