I have the following code:

<?php $myVariablePHP?>
. 
.
.
 MultiView::create(array(
    "name" => "multiviewer2",
    "dataSource" => $this->dataStore("ventasHoy"),
    "clientEvents" => array(
        "changed" => "function(params){
            var myVariable=params.index;
         }",
     ),
....));

How to pass the variable MyVariable to php code, for example to the variable $myVariablePHP

I am trying to export a Multiview (contains 4 different graphics) to PDF and I need to obtain the position of the selected multivew to export the corresponding graphic