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

CodeIgniter features wrappers around some of the most popular forms of fast and dynamic caching. All but file-based caching require specific server requirements, and a Fatal Exception will be thrown ...

BCC Batch Mode, enabling large email lists to be broken into small BCC batches. Sending email is not only simple, but you can configure it on the fly or set your preferences in the ...

The Database Utility Class contains methods that help you manage your database.

CodeIgniter provides a few functions and variables that are globally defined, and are available to you at any point. These do not require loading any additional libraries or helpers.

The Encryption Service provides two-way symmetric (secret key) data encryption. The service will instantiate and/or initialize an encryption handler to suit your parameters as explained below.

Many functions previously found in the CodeIgniter 3 date_helper have been moved to the Time class in CodeIgniter 4. It is recommended to use the Time class instead. Use Time::now()->getTimestamp() to ...

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

The following page contains example code showing how the database class is used. For complete details please read the individual pages describing each function. Note CodeIgniter doesn’t support dots ( ...

The Session class permits you to maintain a user’s “state” and track their activity while they browse your site. CodeIgniter comes with a few session storage drivers, that you can see in the last ...

The Response class extends the HTTP Message Class with methods only appropriate for a server responding to the client that called it.

The Number Helper file contains functions that help you work with numeric data in a locale-aware manner.