Creating a CodeIgniter library is an easy task, for example, take this PHP library:
php-excel library created by Oliver Schwarz is used to generate Excel files—a task that is needed from time to time. Again, this example is not one of our main examples, but it's a good way to see how a library is created. Now, you will be able to create your own and use them.
First, download the library. It comes in a ZIP file, with four files:
license.txt: Here we can see the license under which the library is shipped
readme.txt: Here we can see the change log and some instructions about how to use the library
test.php: Here we can see an example
php-excel.class.php: Here the library is stored; it is the ...