Conditional if issue in php appachi server

I am working on (Localhost) XAMPP Server 3.2.1

This is php file MyAjax.php:

<?php
    $data = isset($_REQUEST['data']);

    if($data == "logout")
    {
        echo "<br />inside logout";
    }
    else if($data == "getReminder")
    {
        echo "<br />inside getReminder";
    }
?>

Output of following url should be inside getReminder

http://ift.tt/1Oyttam 

And Output of following url should be inside logout

http://ift.tt/1Ibfo6c 

But both URLs are returning the same output inside logout.

Please help me what is wrong in this?