set cookie through jquery in php

 <script type="text/javascript">
$(document).ready(function() {
    $("#currency").change(function() {
var id = $(this).val();
        $.ajax({
            url: 'current.php',
            type: 'POST',
            data:{'id':$(this).val()},
            success: function(data)
            {
        location.reload();

            }
        });
    });
});
</script>

current.php
<?php
$id=$_POST['id'];
setcookie("to",$id);
?>

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