Read session value with Javascript

Question

Is it possible to read a session value with Javascript?

For example, if I assigned a value into a session in PHP:

$_SESSION['msg'] = "ABC Message";

Is it possible to read $_SESSION['msg'] with Javascript?

Answer 1

$_SESSION is a server-side construct. You would need to store that variable in $_COOKIE to be able to access it client-side.

Answer 2

.. Or you can use ajax to retrive your server side session value into you client-side javascript.` (quick, dirty and untested example, using jQuery)

Javascript Side:

$.ajax({
      url: "test.php",
      cache: false,
      success: function(html){
        eval( html ); /// UGLY NASTY YOU MUST VALIDATE YOUR INPUTS... JUST AN EXAMPLE
      }
    });

PHP side test.php:

echo 'var myData = "'. $_SESSION['msg'].'"';

Answer 3

A very simple way is to generate the JavaScript with some PHP code:

<script type="text/javascript">
    <?php echo 'var msg = "'.json_encode($_SESSION['msg']).'";';
</script>