Cannot get data in INPUT_GET in php

I am using the RESTful webservice for my application. In that I cant able to get the data in INPUT_GET.

eg.

$courseYear = filter_input(INPUT_GET, 'CourseYear', FILTER_SANITIZE_STRING);
var_dump($courseYear); //null
Copy code

I gave the GET method body value asCourseYear=2005-2007

Please help me to get the value.