title: Amazon Sqs FIFO queue
body: <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>