Please refer to the upgrade instructions corresponding to your installation method.

In addition, you may create your own, custom session drivers based on other kinds of storage, while still taking advantage of the features of the Session class. Sessions will typically run globally ...

The HTML Helper file contains functions that assist in working with HTML.

Returns your site URL, as specified in your config file. The index.php file (or whatever you have set as your site index_page in your config file) will be added to the URL, as will any URI segments ...

CodeIgniter provides a library to help you with certain common functions that you may want to use with Javascript. Please note that CodeIgniter does not require the jQuery library to run, and that any ...

Sending email is not only simple, but you can configure it on the fly or set your preferences in a config file. Here is a basic example demonstrating how you might send email. Note: This example ...

The “auto connect” feature will load and instantiate the database class with every page load. To enable “auto connecting”, add the word database to the library array, as indicated in the following ...

The Table Class provides functions that enable you to auto-generate HTML tables from arrays or database result sets.

This helper is loaded using the following code: ...

The File Helper file contains functions that assist in working with files.

If you don’t know what version of CodeIgniter you are currently running, you can get it from the Debug Toolbar, or simply echo the constant \CodeIgniter\CodeIgniter::CI_VERSION.

As well as calling an applications Controllers via the URL in a browser they can also be loaded via the command-line interface (CLI).