laravel 5 ajax getting data to view as php value

I'm having trouble understanding the ajax in laravel 5:

How to pass data from javascript to view as php variable.

Controller.php (ajax function):

public function getID()
    {
        $studid = Request::get('studid');
        $a = array(
            'studid' => $studid,
        );
        header("Content-type: text/x-json");
        echo json_encode($a);
        exit();
    }

view.blade.php:

(how to write it properly to get $studid data to php so i can compare it in if statement?)

Thanks.

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