// The most basic method
<?php
echo '<script type="text/javascript">',
'someJsFunc();', // Or Whatever
'</script>';
?>
// However, if what you are trying to achieve requires more complexity,
// You might be better off adding the V8JS module, see link below
<script>
var phpadd= <?php echo add(1,2);?> //call the php add function
var phpmult= <?php echo mult(1,2);?> //call the php mult function
var phpdivide= <?php echo divide(1,2);?> //call the php divide function
</script>