6    $renderer = 
$DIC->ui()->renderer();
 
    9    if (isset(
$_GET[
'example']) && 
$_GET[
'example'] == 1) {
 
   10        $upload = 
$DIC->upload();
 
   16            echo json_encode([ 
'success' => 
true, 
'message' => 
'Successfully uploaded file' ]);
 
   17        } 
catch (Exception $e) {
 
   19            echo json_encode([ 
'success' => 
false, 
'message' => $e->getMessage() ]);
 
   24    $uploadUrl = 
$_SERVER[
'REQUEST_URI'] . 
'&example=1';
 
   27                        ->standard($uploadUrl)
 
   28                        ->withUploadButton(
$factory->button()->standard(
'Upload', 
''));
 
   30    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']