Get variable from PHP to JavaScript

<script type="text/javascript">
    var MyJSStringVar = "<?php Print($MyPHPStringVar); ?>";
    var MyJSNumVar = <?php Print($MyPHPNumVar); ?>;
</script>

$.getJSON('http://foo/bar.php", {'num1': 12, 'num2': 27}, function(e) {
    alert('Result from PHP: ' + e.result);
});

$num1 = $_GET['num1'];
$num2 = $_GET['num2'];
echo json_encode(array("result" => $num1 * $num2));

$foo = 123;
echo "<script type="text/javascript">n";
echo "var foo = ${foo};n";
echo "alert('value is:' + foo);n";
echo "</script>n";

<script type="text/javascript">
  var foo = <?php echo json_encode($bar); ?>;
</script>

<?php
$someVar = 1;
?>

<script type="text/javascript">
    var javaScriptVar = "<?php echo $someVar; ?>";
</script>