title: How to return CKEditorFuncNum?
body: <p><code>$funcNum = $_GET['CKEditorFuncNum'] ;</code> is not returning the number.</p>
  
  <p>I tried creating the upload.php for ckeditor uploadimage plugin according to 
  <a href="https://stackoverflow.com/a/44553006/8719001">https://stackoverflow.com/a/44553006/8719001</a> (sorry can't add comments yet)</p>
  
  <p>which includes <code>echo "&lt;script type='text/javascript'&gt;window.parent.CKEDITOR.tools.callFunction($funcNum, '$url', '$message');&lt;/script&gt;";</code></p>
  
  <p>However when I drop images it doesn't work and in the console I get the Response Text which doesn't show any funcNumber:</p>
  
  <pre><code>"&lt;script type='text/javascript'&gt;window.parent.CKEDITOR.tools.callFunction(, 'https://example.com/upload/test.jpg', '');&lt;/script&gt;"
  </code></pre>
  
  <p>I think this might be part of filebrowser plugin? 
  Which I have enabled and also declared <code>$settings['filebrowserUploadUrl'] =</code></p>