Zend Certified PHP Engineer (ZCPE) Practice Test

The superglobal array that contains session variables in PHP is $_SESSION. This array is part of PHP's session management feature, which allows developers to store user-specific data across multiple pages during a user's session. When a session is started using the session_start() function, PHP creates a unique identifier for the session and generates the $_SESSION array where session variables can be stored and accessed.

For example, if you want to save a user's name in a session, you can do so with the following code:

```php

session_start();

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

```

Throughout the user's session, you can access and modify the $_SESSION array to maintain state and keep track of user data as they navigate your application.

Other superglobal arrays, such as $_POST, $_COOKIE, and $_GET, serve different purposes. $_POST is used for collecting data submitted through HTTP POST requests, storing information like form submissions. $_COOKIE is utilized for accessing browser cookies, which are small pieces of data stored on the client's machine by the web browser. $_GET is used for retrieving query string parameters passed in the URL. Each of these serves specific needs in web development, but when it comes to managing session data, $_SESSION is the appropriate