can we use php variable in javascript and javascript variable in php code?

Question

i m having problem in using php variable in javascript and having problem in using javascript variable in php.

$UpdateText="updateReTotal(Tills,'pos_cash','{$till->till_id}');updateVariance('{$till->till_id}')";

echo '<script type="text/javascript">'
    , 'testFunctionForUpdateTotal(.$UpdateText.);'
    , '</script>';

Answer 1

You just have a quoting issue. :

$UpdateText="updateReTotal(Tills,'pos_cash','{$till->till_id}');updateVariance('{$till->till_id}')";

echo '<script type="text/javascript">'
    , "testFunctionForUpdateTotal('".$UpdateText."');"
    , '</script>';

This is a good example of why you should avoid using echo statements to output HTML. PHP is designed to allow you to embed PHP inside of your HTML and you should take advantage of that:

    $UpdateText="updateReTotal(Tills,'pos_cash','{$till->till_id}');updateVariance('{$till->till_id}')";
?>
    <script type="text/javascript">
        testFunctionForUpdateTotal('<?= $UpdateText; ?>');
    </script>';