How can you access the session variables in PHP?

Accessing session variables in PHP is done through the superglobal array known as $_SESSION. This superglobal is an associative array that PHP provides specifically for session management. When you start a session using session_start(), any session variables you set are accessible through this array.

For example, if you store a value in the session like this:

$_SESSION['username'] = 'JohnDoe';

You can retrieve that value later in your script by referencing $_SESSION['username']. This makes it easy to maintain state across multiple page requests, as session data is stored on the server and is uniquely associated with each user.

Other options do not provide a valid method for accessing session variables. Using $SESSION would result in an undefined variable error since PHP does not recognize it as a superglobal. The functions session_array() and session_var() do not exist in PHP, which makes them invalid options for accessing session data. Therefore, using the $_SESSION superglobal is the correct and standard way to access session variables in PHP.