Pass the Javascript variable to PHP using AJAX Jquery

a very basic example for passing the javascript variable to a php page is explained here :

index.php

<html>
<head>
    <script src="//code.jquery.com/jquery-1.11.0.min.js"></script>
    <script type="text/javascript">
        var var_data = "Hello World";
        $(document).ready(function() {
            $('#sub').click(function() {
                $.ajax({
                    url: 'response.php',
                    type: 'GET',
                    data: { var_PHP_data: var_data },
                    success: function(data) {
                        $('#result').html(data);
                    },
                    error: function(XMLHttpRequest, textStatus, errorThrown) {
                        //case error                    }
                });
            });
        });
    </script>
</head>
<body>
<input type="submit" value="Submit" id="sub"/>
<p id="result"></p>
</body>
</html>

response.php

<?php
$test = $_GET['var_PHP_data'];
echo "variable is : .$test";
?>

 OUTPUT :

 

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