title: AWS Code works in PHP 5.5.6 but not in PHP 5.3.1
body: <p>Below code works in PHP version 5.5.6 and not in PHP 5.3.1.
  When running this file, it shows an empty page.</p>
  
  <pre><code>use Aws\S3\S3Client;
  use Aws\S3\Exception\S3Exception;
  
  $bucket = 'report160316';
  $keyname = 'xxxxxxxxxxxxxxx';
  $secret = 'xxxxxxxxxxxxxxxxxxxx';
  // Instantiate the client.
  $s3 = S3Client::factory([
      'key' =&gt;$keyname,
      'secret' =&gt;$secret,
  ]);
  </code></pre>