6    $renderer = 
$DIC->ui()->renderer();
 
    8    if (isset(
$_GET[
'example']) && 
$_GET[
'example'] == 4) {
 
   10        echo json_encode([
'success' => 
false, 
'message' => 
'Unable to store file on server']);
 
   14    $uploadUrl = 
$_SERVER[
'REQUEST_URI'] . 
'&example=4';
 
   15    $dropzone = 
$factory->dropzone()->file()->standard($uploadUrl)
 
   16        ->withMessage(
'Drag and drop your files here. Note that any upload will be failing!')
 
   17        ->withUploadButton(
$factory->button()->standard(
'Upload', 
''));
 
   18    return $renderer->render($dropzone);
 
An exception for terminatinating execution or to throw for unit testing.
if((!isset($_SERVER['DOCUMENT_ROOT'])) OR(empty($_SERVER['DOCUMENT_ROOT']))) $_SERVER['DOCUMENT_ROOT']