How do you get a group URL in PHP?

<form method="POST" action="process.php"><?php  echo $api->widget->getInputTag('qs-file', array( "data-crop" => "4:3", "data-images-only" => "true" ,"data-image-shrink"=>"1024X1024 ")); ?> </form>

Let's say you have the  form above - it has a multiple-file widget with fixed-aspect crop and client-side image resize.

Then your process.php should contain code that retrieves group URL similar to this:

<?php <br>$file_group_id = $_POST['qs-file'];   <br>$fileGROUP = $api->getGroup($file_group_id);$fileGROUP->data['url'];?>