This piece of code can be used in Joomla extension RSForms! Pro. This piece of code will dynamical check a radio button depending on the last part of the URL you visit. Place this snippet in the field "items" of a Form Field type = "Radio Group". Example according to this snippet: visit URL http://example.com/path/to/last/element/product1 and it…

dynamical-set-radio-button-in-RSForm

//<code>
$url = $_SERVER["REQUEST_URI"];
$tokens = explode('/', strtok($url, '?'));
$last_element = end(array_values($tokens));
$le = $last_element;

switch ($le) {
  case 'product1':
   $items = "item1[c]\nitem2\nitem3\nitem4\nitem5";
    break;
    
  case 'product2':
   $items = "item1\nitem2[c]\nitem3\nitem4\nitem5";
    break;
    
  default:
   $items = "item1\nitem2\nitem3\nitem4\nitem5";
    break;
}
return $items;
//</code>