I know that there are many questions about this but I cannot make it work.

My HTML (test.htm) has only this code

<?php

$var = 'foo';

?>

<script type=text/javascript language=javascript>

var val = <?=$var?>;

alert(val);

</script>

But when I open the file with the browser the value of val is <?=$var?> and not 'foo'

How can I make it work?