Скачать или смотреть CodeIgniter Tutorial Part 3(Hindi) | worldgyan | codeigniter

How do Sessions work?
When a page is loaded, the session class will check to see if valid session cookie is sent by the user’s browser. If a sessions cookie does not exist (or if it doesn’t match one stored on the server or has expired) a new session will be created and saved.

If a valid session does exist, its information will be updated. With each update, the session ID may be regenerated if configured to do so.

It’s important for you to understand that once initialized, the Session class runs automatically. There is nothing you need to do to cause the above behavior to happen. You can, as you’ll see below, work with session data, but the process of reading, writing, and updating a session is automatic.
What is Session Data?
Session data is simply an array associated with a particular session ID (cookie).

If you’ve used sessions in PHP before, you should be familiar with PHP’s $_SESSION superglobal (if not, please read the content on that link).

CodeIgniter gives access to its session data through the same means, as it uses the session handlers’ mechanism provided by PHP. Using session data is as simple as manipulating (read, set and unset values) the $_SESSION array.
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