title: How to send additional data using PLupload?
body: <p>I'm using <a href="http://www.plupload.com" rel="noreferrer">plupload</a> to make an ajax file uploading.
  Now the plupload.Uploader class has many options but none are additional data.</p>
  
  <p>For Example :</p>
  
  <pre><code>var uploader = new plupload.Uploader({
      runtimes : 'gears,html5,flash,silverlight,browserplus',
      browse_button : 'pickfiles',
      container : 'contact_container',
      max_file_size : '10mb',
      url : 'upload.php',
      flash_swf_url : '/plupload/js/plupload.flash.swf',
      silverlight_xap_url : '/plupload/js/plupload.silverlight.xap',
      filters : [
          {title : "Image files", extensions : "jpg,gif,png"},
          {title : "Zip files", extensions : "zip"}
      ],
      resize : {width : 320, height : 240, quality : 90}
  });
  </code></pre>
  
  <p>What i'm trying to achive is i have a folder in my server where all the uploads 
  are being saved.
  I neeed inside the folder to create a sub-folder to each user that have uploaded files there.
  How can i add data like id of the user to the instance of plupload.Uploader?
  Or if i'll wrap a form inside the container div, will i be able to see it in the $_REQUEST?
  Or is there some other way i can achive this?</p>