user_guide_src/source/general/libraries.rst

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Using CodeIgniter Libraries
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All of the available libraries are located in your *system/libraries/*
directory. In most cases, to use one of these classes involves initializing
it within a :doc:`controller <controllers>` using the following
initialization method::

	$this->load->library('class_name');

Where 'class_name' is the name of the class you want to invoke. For
example, to load the :doc:`Form Validation Library
<../libraries/form_validation>` you would do this::

	$this->load->library('form_validation');

Once initialized you can use it as indicated in the user guide page
corresponding to that class.

Additionally, multiple libraries can be loaded at the same time by
passing an array of libraries to the load method.

Example::

	$this->load->library(array('email', 'table'));

Creating Your Own Libraries
===========================

Please read the section of the user guide that discusses how to
:doc:`create your own libraries <creating_libraries>`.