AWS SQS Deleting Messages Using the Receive Handle

I am trying to set up SQS and after receiving a message I need to remove it from the queue.

Client creation -

$client = Aws\Sqs\SqsClient::factory(array(
                    'key'    => '******',
                    'secret' => '******',
                    'region' => 'ap-southeast-1'
            ));

      

        
        
        
      

    

Sending a message

public static function SendMessage()
    {
        if(!isset(self::$queueUrl))
            self::getQueueUrl();

        $command = "This is a command";
        $commandstring = json_encode($command);

        self::$client->sendMessage(array(
                'QueueUrl'    => self::$queueUrl,
                'MessageBody' => $commandstring,
        ));
    }

      

        
        
        
      

    

Receiving a message

public static function RecieveMessage()
    {
        if(!isset(self::$queueUrl))
            self::getQueueUrl();

        $result = self::$client->receiveMessage(array(
                'QueueUrl' => self::$queueUrl,
        ));

//      echo "Message Recieved >>  ";
        print_r($result);
        foreach ($result->getPath('Messages/*/Body') as $messageBody) {
            // Do something with the message
            echo $messageBody;
            //print_r(json_decode($messageBody));
        }

        foreach ($result->getPath('Messages/*/ReceiptHandle') as $ReceiptHandle) {
            self::$client->deleteMessage(self::$queueUrl, $ReceiptHandle);
        }

    }

      

        
        
        
      

    

When I try to delete a message using the Handle Handle in the receive message code, I get an error from Guzzle - Allowable fatal error: argument 2 passed to Guzzle \ Service \ Client :: getCommand () must be an array given by string.

Now, after searching a lot, I was able to find similar questions that claim they were using the wrong SDK version. I still can't narrow it down. I am using the zip version of the latest sdk 2.6.15