Question

Is it possible to access session variables made in from JavaScript, and how can I replicate this PHP code in JavaScript?

if(empty($_SESSION['name'] {
   echo 'foo';
}

Answer 1

You could access a page via Ajax which would return the variable value:

Using jQuery:

$.get('myVariable.php', function ( data ) {
    alert(data)
});

And the PHP page (myVariable.php):

<?php echo $_SESSION['user_id']; ?>