Codeigniter has some predefined library, All of the available libraries are located in your system/libraries/ directory.
In most cases, to use one amongst these categories involves initializing it inside a controller mistreatment the subsequent data format method:
How to load a library?
Such as “form_validation” is a predefined library in codeigniter, which is used to form validation, for example:
How to load multiple libraries at a time?
multiple libraries are often loaded at constant time bypassing the associate array of libraries to the loading technique
<?php $this->load->library( array('email', 'table') );
List of Predefined Libraries in Codeigniter