The library is an important part of the CodeIgniter framework. It has a large collection of libraries files that are used to increase the performance of an application. By default, all CodeIgniter libraries are stored at the system/libraries folder. If you want to use any of the libraries’ classes, you need to load it at the controller file by using the following method.

The library files enables you to load many library classes into a controller; for this, you need to pass an array argument to the library() function and define the class names you want to load into the library.

For example:

Library Classes

By default, all the library classes are stored in the system/libraries folder. Each class has different functionality that makes it easier to use the CodeIgniter application. The Library folder contains several library classes and its descriptions, which are shown in the following table.

Libraries Names Description of Library classes
Benchmarking Class By default it is active in the Codeigniter application, which is used to calculate the time difference between any two marked points.
Caching Class As we know, cache classes have some methods that are used to quickly fetch web pages from the server. And if you are working with file-based caching, it needs specific server requirements. If the server requirements are not satisfied, it will throw an exception.  
Calendaring class It is used to create a dynamic calendar in your web application.
Shopping Cart Class It helps users to add or remove the items from the shopping cart while shopping online. The items added in the cart remain active during the entire session,
Config Class It allows you to set and retrieve configuration preferences. By default, these preferences are set in the application/config/config.php.
Email Class It includes various functions that enable you to send and receive emails in the Codeigniter application.
Encryption Class It can provide a two-way data encryption technique. Before using the encrypt class, your system must have a Mcrypt PHP extension.
File Uploading Class It is used to perform various functions related to the file uploading. It allows the user to set file-related preferences such as file uploading, file size, the format of files, etc.
Form validation Class It includes various validation functions that are used to validate the form.
FTP Class It has various FTP functions that allow files to be transferred to remote servers. A remote file can also be updated, renamed, and deleted from the server.
Image manipulation Class As the class name defines, it is used to manipulate an image such as compress, crop, rotate, thumbnail creation and watermarking, etc.
Input Class It is used to preprocess input data globally for security purposes. It also uses some helper functions that are used to receive input data and to pre-process it.
Language Class It includes some predefined functions that are used to define language files and text that can be retrieved for internationalization purposes.
Loader Class As the name suggests, loaders are used to load various elements such as view files, helpers, drivers, models, and custom files.
JavaScript Class It contains predefined functions that allow it to work with JavaScript.
Migration Class It includes some functions that allow for updating your database in a structured and organized way.
Output Class As the name suggests, the class is used to send web page output to the requested browser. The Output class caches the web pages to be sent to the server.
Pagination Class It helps in creating pagination functionality on the web page to move from one page to another in the browser.
Template Parser Class It contains some method that is used to substitute a simple text to the pseudo-variable format that contained in view files.
Security Class As the name suggests, the class is used to build a secure web application. And it safely processes all input data with the use of XSS filtering, CSRF, class references, and more.
Session Class It allows an application to maintain user session data and track their activity while they are browsing your site.
HTML table As the name defines, this class is used to create an html table from an array or database automatically.
Trackback data It has contains predefined functions that allow the user to initialize a class, create a trackback table, perform a trackback process, send and receive trackback data, and so on.
Typography Class It contains functions that help to change the format of the text.
Unit Testing Class As the name suggests, unit testing is a method of testing each module of the software, and test cases are written for each module to remove bugs and make error-free software.
URI Class It contains some methods that are used to fetch a piece of information from a URI string. A URI routing enables you to obtain information from re-routed segments.
User Agent Class It includes some predefined functions that help the developer to identify information about mobile devices, browsers, robotic activities, etc. coming to the site.
XML-RPC and XML-RPC Server Classes The class of CodeIgniter helps the user to send a request to another server and also creates its own XML-RPC server to receive the request.
Zip Encoding Class It allows the user to create zip archives of your data in the system. The archives file can be downloaded to your desktop or saved to the system directory.

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