title: Dropbox API Architecture issue
body: <p>I have a problem while using dropbox API and I have no been able to find any solutions. I am using the example code from their site and having issues.</p>
  
  <pre><code>&lt;?php
  require_once "../../dropbox/lib/Dropbox/autoload.php";
  use \Dropbox as dbx;
  $appInfo = dbx\AppInfo::loadFromJsonFile("../../key.json");
  $dbxConfig = new dbx\Config($appInfo, "PHP-Example/1.0");
  $webAuth = new dbx\WebAuth($dbxConfig);
  list($requestToken, $authorizeUrl) = $webAuth-&gt;start('http://example.com');
  ?&gt;
  </code></pre>
  
  <p>This code gives me an error and an exception on the final line. This is the exception</p>
  
  <pre><code>PHP Fatal error:  Uncaught exception 'Exception' with message 'The Dropbox SDK at least a 64-bit build of PHP, but it looks like we're running a 32-bit build    (PHP_INT_MAX=2147483647).  Library: "/var/dropbox/lib/Dropbox/RequestUtil.php"' in /var/dropbox/lib/Dropbox/RequestUtil.php:15
  Stack trace:
  #0 /var/dropbox/lib/Dropbox/autoload.php(27): require_once()
  #1 [internal function]: Dropbox\autoload('Dropbox\Request...')
  #2 /var/dropbox/lib/Dropbox/WebAuth.php(73): spl_autoload_call('Dropbox\Request...')
  #3 /var/www/home/index.php(12): Dropbox\WebAuth-&gt;start('http://example....')
  #4 {main}
    thrown in /var/dropbox/lib/Dropbox/RequestUtil.php on line 15
  </code></pre>
  
  <p>I don't know what to do because I'm pretty sure I'm using a 64bit system... here is my uname output...</p>
  
  <p><code>Linux me 3.2.0-45-generic #70-Ubuntu SMP Wed May 29 20:12:06 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux</code></p>
  
  <p>Any ideas or insight into why I am getting this error, or how to install a 64bit version of php...? If it helps, this is my php -v output</p>
  
  <p><code>root@me:/var/www/home# php -v
  PHP 5.4.6-1ubuntu1.2 (cli) (built: Mar 11 2013 14:54:18) 
  Copyright (c) 1997-2012 The PHP Group
  Zend Engine v2.4.0, Copyright (c) 1998-2012 Zend Technologies</code></p>