Check screen width and then pass variable on php variable

I want to check the screen resolution of the user. Now the solution is to check the screen resolution with AJAX and then pass variable to a PHP page. I have tried this but it does not work.

var width = $(window).width();

    url: "/the-php-page-i-want-to-show-with-output.php",
    data: {
        screenwidth: width
}).done(function() {

and the php page /the-php-page-i-want-to-show-with-output.php:

    $width11 = $_REQUEST['screenwidth'];

    if ($width11 < 769)
        echo '<div class="test">mobile</div>';
        echo '<div class="test">desktop</div>';

Where is the problem?

Source: ajax

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