Checking session data

You can check whether a variable has been set in a user's session using the function isset(), as you would a normal variable. Because the $_SESSION superglobal is only initialised once session_start() has been called, you need to call session_start() before using isset() on a session variable. For example:

<?php
    session_start();

    if (isset($_SESSION['FirstName'])) {
        /// your code here
    }
?>

You can, of course, also use the empty() function with session data, or indeed any other function - the $_SESSION array and its data can be used like any other array.

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