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+<li class="toctree-l2"><a class="reference internal" href="../libraries/caching.html">Caching Driver</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/calendar.html">Calendaring Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/cart.html">Shopping Cart Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/config.html">Config Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/email.html">Email Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/encrypt.html">Encrypt Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/encryption.html">Encryption Library</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/file_uploading.html">File Uploading Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/form_validation.html">Form Validation</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/ftp.html">FTP Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/image_lib.html">Image Manipulation Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/input.html">Input Class</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="../libraries/migration.html">Migrations Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/output.html">Output Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/pagination.html">Pagination Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/parser.html">Template Parser Class</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="../libraries/table.html">HTML Table Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/trackback.html">Trackback Class</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="../libraries/xmlrpc.html">XML-RPC and XML-RPC Server Classes</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="../database/configuration.html">Database Configuration</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="../database/queries.html">Running Queries</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../database/results.html">Generating Query Results</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../database/helpers.html">Query Helper Functions</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../database/query_builder.html">Query Builder Class</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="../tutorial/static_pages.html">Static pages</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../tutorial/news_section.html">News section</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../tutorial/create_news_items.html">Create news items</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../tutorial/conclusion.html">Conclusion</a></li>
+</ul>
+</li>
+</ul>
+<ul>
+<li class="toctree-l1"><a class="reference internal" href="../contributing/index.html">Contributing to CodeIgniter</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="../documentation/index.html">Writing CodeIgniter Documentation</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../DCO.html">Developer’s Certificate of Origin 1.1</a></li>
+</ul>
+</li>
+</ul>
+<ul class="current">
+<li class="toctree-l1 current"><a class="reference internal" href="index.html">General Topics</a><ul class="current">
+<li class="toctree-l2"><a class="reference internal" href="urls.html">CodeIgniter URLs</a></li>
+<li class="toctree-l2"><a class="reference internal" href="controllers.html">Controllers</a></li>
+<li class="toctree-l2"><a class="reference internal" href="reserved_names.html">Reserved Names</a></li>
+<li class="toctree-l2"><a class="reference internal" href="views.html">Views</a></li>
+<li class="toctree-l2"><a class="reference internal" href="models.html">Models</a></li>
+<li class="toctree-l2"><a class="reference internal" href="helpers.html">Helpers</a></li>
+<li class="toctree-l2"><a class="reference internal" href="libraries.html">Using CodeIgniter Libraries</a></li>
+<li class="toctree-l2 current"><a class="current reference internal" href="#">Creating Libraries</a></li>
+<li class="toctree-l2"><a class="reference internal" href="drivers.html">Using CodeIgniter Drivers</a></li>
+<li class="toctree-l2"><a class="reference internal" href="creating_drivers.html">Creating Drivers</a></li>
+<li class="toctree-l2"><a class="reference internal" href="core_classes.html">Creating Core System Classes</a></li>
+<li class="toctree-l2"><a class="reference internal" href="ancillary_classes.html">Creating Ancillary Classes</a></li>
+<li class="toctree-l2"><a class="reference internal" href="hooks.html">Hooks - Extending the Framework Core</a></li>
+<li class="toctree-l2"><a class="reference internal" href="autoloader.html">Auto-loading Resources</a></li>
+<li class="toctree-l2"><a class="reference internal" href="common_functions.html">Common Functions</a></li>
+<li class="toctree-l2"><a class="reference internal" href="compatibility_functions.html">Compatibility Functions</a></li>
+<li class="toctree-l2"><a class="reference internal" href="routing.html">URI Routing</a></li>
+<li class="toctree-l2"><a class="reference internal" href="errors.html">Error Handling</a></li>
+<li class="toctree-l2"><a class="reference internal" href="caching.html">Caching</a></li>
+<li class="toctree-l2"><a class="reference internal" href="profiling.html">Profiling Your Application</a></li>
+<li class="toctree-l2"><a class="reference internal" href="cli.html">Running via the CLI</a></li>
+<li class="toctree-l2"><a class="reference internal" href="managing_apps.html">Managing your Applications</a></li>
+<li class="toctree-l2"><a class="reference internal" href="environments.html">Handling Multiple Environments</a></li>
+<li class="toctree-l2"><a class="reference internal" href="alternative_php.html">Alternate PHP Syntax for View Files</a></li>
+<li class="toctree-l2"><a class="reference internal" href="security.html">Security</a></li>
+<li class="toctree-l2"><a class="reference internal" href="styleguide.html">PHP Style Guide</a></li>
+</ul>
+</li>
+</ul>
+<ul>
+<li class="toctree-l1"><a class="reference internal" href="../libraries/index.html">Libraries</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/benchmark.html">Benchmarking Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/caching.html">Caching Driver</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/calendar.html">Calendaring Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/cart.html">Shopping Cart Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/config.html">Config Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/email.html">Email Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/encrypt.html">Encrypt Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/encryption.html">Encryption Library</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/file_uploading.html">File Uploading Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/form_validation.html">Form Validation</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/ftp.html">FTP Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/image_lib.html">Image Manipulation Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/input.html">Input Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/javascript.html">Javascript Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/language.html">Language Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/loader.html">Loader Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/migration.html">Migrations Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/output.html">Output Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/pagination.html">Pagination Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/parser.html">Template Parser Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/security.html">Security Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/sessions.html">Session Library</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/table.html">HTML Table Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/trackback.html">Trackback Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/typography.html">Typography Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/unit_testing.html">Unit Testing Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/uri.html">URI Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/user_agent.html">User Agent Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/xmlrpc.html">XML-RPC and XML-RPC Server Classes</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../libraries/zip.html">Zip Encoding Class</a></li>
+</ul>
+</li>
+</ul>
+<ul>
+<li class="toctree-l1"><a class="reference internal" href="../database/index.html">Database Reference</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="../database/examples.html">Quick Start: Usage Examples</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../database/configuration.html">Database Configuration</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../database/connecting.html">Connecting to a Database</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../database/queries.html">Running Queries</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../database/results.html">Generating Query Results</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../database/helpers.html">Query Helper Functions</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../database/query_builder.html">Query Builder Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../database/transactions.html">Transactions</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../database/metadata.html">Getting MetaData</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../database/call_function.html">Custom Function Calls</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../database/caching.html">Query Caching</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../database/forge.html">Database Manipulation with Database Forge</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../database/utilities.html">Database Utilities Class</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../database/db_driver_reference.html">Database Driver Reference</a></li>
+</ul>
+</li>
+</ul>
+<ul>
+<li class="toctree-l1"><a class="reference internal" href="../helpers/index.html">Helpers</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/array_helper.html">Array Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/captcha_helper.html">CAPTCHA Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/cookie_helper.html">Cookie Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/date_helper.html">Date Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/directory_helper.html">Directory Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/download_helper.html">Download Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/email_helper.html">Email Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/file_helper.html">File Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/form_helper.html">Form Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/html_helper.html">HTML Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/inflector_helper.html">Inflector Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/language_helper.html">Language Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/number_helper.html">Number Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/path_helper.html">Path Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/security_helper.html">Security Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/smiley_helper.html">Smiley Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/string_helper.html">String Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/text_helper.html">Text Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/typography_helper.html">Typography Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/url_helper.html">URL Helper</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../helpers/xml_helper.html">XML Helper</a></li>
+</ul>
+</li>
+</ul>
+
+          
+        
+      </div>
+      &nbsp;
+    </nav>
+
+    <section data-toggle="wy-nav-shift" class="wy-nav-content-wrap">
+
+      
+      <nav class="wy-nav-top" role="navigation" aria-label="top navigation">
+        <i data-toggle="wy-nav-top" class="fa fa-bars"></i>
+        <a href="../index.html">CodeIgniter</a>
+      </nav>
+
+
+      
+      <div class="wy-nav-content">
+        <div class="rst-content">
+          <div role="navigation" aria-label="breadcrumbs navigation">
+  <ul class="wy-breadcrumbs">
+    <li><a href="../index.html">Docs</a> &raquo;</li>
+      
+        <li><a href="index.html">General Topics</a> &raquo;</li>
+      
+    <li>Creating Libraries</li>
+    <li class="wy-breadcrumbs-aside">
+      
+    </li>
+    <div style="float:right;margin-left:5px;" id="closeMe">
+      <img title="Classic Layout" alt="classic layout" src="data:image/gif;base64,R0lGODlhFAAUAJEAAAAAADMzM////wAAACH5BAUUAAIALAAAAAAUABQAAAImlI+py+0PU5gRBRDM3DxbWoXis42X13USOLauUIqnlsaH/eY6UwAAOw==" />
+    </div>
+  </ul>
+  <hr/>
+</div>
+          <div role="main" class="document">
+            
+  <div class="section" id="creating-libraries">
+<h1>Creating Libraries<a class="headerlink" href="#creating-libraries" title="Permalink to this headline">¶</a></h1>
+<p>When we use the term “Libraries” we are normally referring to the
+classes that are located in the libraries directory and described in the
+Class Reference of this user guide. In this case, however, we will
+instead describe how you can create your own libraries within your
+application/libraries directory in order to maintain separation between
+your local resources and the global framework resources.</p>
+<p>As an added bonus, CodeIgniter permits your libraries to extend native
+classes if you simply need to add some functionality to an existing
+library. Or you can even replace native libraries just by placing
+identically named versions in your <em>application/libraries</em> directory.</p>
+<p>In summary:</p>
+<ul class="simple">
+<li>You can create entirely new libraries.</li>
+<li>You can extend native libraries.</li>
+<li>You can replace native libraries.</li>
+</ul>
+<p>The page below explains these three concepts in detail.</p>
+<div class="admonition note">
+<p class="first admonition-title">Note</p>
+<p class="last">The Database classes can not be extended or replaced with your
+own classes. All other classes are able to be replaced/extended.</p>
+</div>
+<div class="section" id="storage">
+<h2>Storage<a class="headerlink" href="#storage" title="Permalink to this headline">¶</a></h2>
+<p>Your library classes should be placed within your <em>application/libraries</em>
+directory, as this is where CodeIgniter will look for them when they are
+initialized.</p>
+</div>
+<div class="section" id="naming-conventions">
+<h2>Naming Conventions<a class="headerlink" href="#naming-conventions" title="Permalink to this headline">¶</a></h2>
+<ul class="simple">
+<li>File names must be capitalized. For example: Myclass.php</li>
+<li>Class declarations must be capitalized. For example: class Myclass</li>
+<li>Class names and file names must match.</li>
+</ul>
+</div>
+<div class="section" id="the-class-file">
+<h2>The Class File<a class="headerlink" href="#the-class-file" title="Permalink to this headline">¶</a></h2>
+<p>Classes should have this basic prototype:</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="o">&lt;?</span><span class="nx">php</span>
+<span class="nb">defined</span><span class="p">(</span><span class="s1">&#39;BASEPATH&#39;</span><span class="p">)</span> <span class="k">OR</span> <span class="k">exit</span><span class="p">(</span><span class="s1">&#39;No direct script access allowed&#39;</span><span class="p">);</span>
+
+<span class="k">class</span> <span class="nc">Someclass</span> <span class="p">{</span>
+
+        <span class="k">public</span> <span class="k">function</span> <span class="nf">some_method</span><span class="p">()</span>
+        <span class="p">{</span>
+        <span class="p">}</span>
+<span class="p">}</span>
+</pre></div>
+</div>
+<div class="admonition note">
+<p class="first admonition-title">Note</p>
+<p class="last">We are using the name Someclass purely as an example.</p>
+</div>
+</div>
+<div class="section" id="using-your-class">
+<h2>Using Your Class<a class="headerlink" href="#using-your-class" title="Permalink to this headline">¶</a></h2>
+<p>From within any of your <a class="reference internal" href="controllers.html"><span class="doc">Controller</span></a> methods you
+can initialize your class using the standard:</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">library</span><span class="p">(</span><span class="s1">&#39;someclass&#39;</span><span class="p">);</span>
+</pre></div>
+</div>
+<p>Where <em>someclass</em> is the file name, without the “.php” file extension.
+You can submit the file name capitalized or lower case. CodeIgniter
+doesn’t care.</p>
+<p>Once loaded you can access your class using the lower case version:</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">someclass</span><span class="o">-&gt;</span><span class="na">some_method</span><span class="p">();</span><span class="nx"> </span> <span class="c1">// Object instances will always be lower case</span>
+</pre></div>
+</div>
+</div>
+<div class="section" id="passing-parameters-when-initializing-your-class">
+<h2>Passing Parameters When Initializing Your Class<a class="headerlink" href="#passing-parameters-when-initializing-your-class" title="Permalink to this headline">¶</a></h2>
+<p>In the library loading method you can dynamically pass data as an
+array via the second parameter and it will be passed to your class
+constructor:</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$params</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span><span class="s1">&#39;type&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;large&#39;</span><span class="p">,</span> <span class="s1">&#39;color&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;red&#39;</span><span class="p">);</span>
+
+<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">library</span><span class="p">(</span><span class="s1">&#39;someclass&#39;</span><span class="p">,</span> <span class="nv">$params</span><span class="p">);</span>
+</pre></div>
+</div>
+<p>If you use this feature you must set up your class constructor to expect
+data:</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="o">&lt;?</span><span class="nx">php</span> <span class="nb">defined</span><span class="p">(</span><span class="s1">&#39;BASEPATH&#39;</span><span class="p">)</span> <span class="k">OR</span> <span class="k">exit</span><span class="p">(</span><span class="s1">&#39;No direct script access allowed&#39;</span><span class="p">);</span>
+
+<span class="k">class</span> <span class="nc">Someclass</span> <span class="p">{</span>
+
+        <span class="k">public</span> <span class="k">function</span> <span class="nf">__construct</span><span class="p">(</span><span class="nv">$params</span><span class="p">)</span>
+        <span class="p">{</span>
+                <span class="c1">// Do something with $params</span>
+        <span class="p">}</span>
+<span class="p">}</span>
+</pre></div>
+</div>
+<p>You can also pass parameters stored in a config file. Simply create a
+config file named identically to the class file name and store it in
+your <em>application/config/</em> directory. Note that if you dynamically pass
+parameters as described above, the config file option will not be
+available.</p>
+</div>
+<div class="section" id="utilizing-codeigniter-resources-within-your-library">
+<h2>Utilizing CodeIgniter Resources within Your Library<a class="headerlink" href="#utilizing-codeigniter-resources-within-your-library" title="Permalink to this headline">¶</a></h2>
+<p>To access CodeIgniter’s native resources within your library use the
+<code class="docutils literal"><span class="pre">get_instance()</span></code> method. This method returns the CodeIgniter super
+object.</p>
+<p>Normally from within your controller methods you will call any of the
+available CodeIgniter methods using the <code class="docutils literal"><span class="pre">$this</span></code> construct:</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">helper</span><span class="p">(</span><span class="s1">&#39;url&#39;</span><span class="p">);</span>
+<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">library</span><span class="p">(</span><span class="s1">&#39;session&#39;</span><span class="p">);</span>
+<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">config</span><span class="o">-&gt;</span><span class="na">item</span><span class="p">(</span><span class="s1">&#39;base_url&#39;</span><span class="p">);</span>
+<span class="c1">// etc.</span>
+</pre></div>
+</div>
+<p><code class="docutils literal"><span class="pre">$this</span></code>, however, only works directly within your controllers, your
+models, or your views. If you would like to use CodeIgniter’s classes
+from within your own custom classes you can do so as follows:</p>
+<p>First, assign the CodeIgniter object to a variable:</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$CI</span> <span class="o">=&amp;</span> <span class="nx">get_instance</span><span class="p">();</span>
+</pre></div>
+</div>
+<p>Once you’ve assigned the object to a variable, you’ll use that variable
+<em>instead</em> of <code class="docutils literal"><span class="pre">$this</span></code>:</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$CI</span> <span class="o">=&amp;</span> <span class="nx">get_instance</span><span class="p">();</span>
+
+<span class="nv">$CI</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">helper</span><span class="p">(</span><span class="s1">&#39;url&#39;</span><span class="p">);</span>
+<span class="nv">$CI</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">library</span><span class="p">(</span><span class="s1">&#39;session&#39;</span><span class="p">);</span>
+<span class="nv">$CI</span><span class="o">-&gt;</span><span class="na">config</span><span class="o">-&gt;</span><span class="na">item</span><span class="p">(</span><span class="s1">&#39;base_url&#39;</span><span class="p">);</span>
+<span class="c1">// etc.</span>
+</pre></div>
+</div>
+<div class="admonition note">
+<p class="first admonition-title">Note</p>
+<p>You’ll notice that the above <code class="docutils literal"><span class="pre">get_instance()</span></code> function is being
+passed by reference:</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$CI</span> <span class="o">=&amp;</span> <span class="nx">get_instance</span><span class="p">();</span>
+</pre></div>
+</div>
+<p class="last">This is very important. Assigning by reference allows you to use the
+original CodeIgniter object rather than creating a copy of it.</p>
+</div>
+<p>However, since a library is a class, it would be better if you
+take full advantage of the OOP principles. So, in order to
+be able to use the CodeIgniter super-object in all of the class
+methods, you’re encouraged to assign it to a property instead:</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">class</span> <span class="nc">Example_library</span> <span class="p">{</span>
+
+        <span class="k">protected</span> <span class="nv">$CI</span><span class="p">;</span>
+
+        <span class="c1">// We&#39;ll use a constructor, as you can&#39;t directly call a function</span>
+        <span class="c1">// from a property definition.</span>
+        <span class="k">public</span> <span class="k">function</span> <span class="nf">__construct</span><span class="p">()</span>
+        <span class="p">{</span>
+                <span class="c1">// Assign the CodeIgniter super-object</span>
+                <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">CI</span> <span class="o">=&amp;</span> <span class="nx">get_instance</span><span class="p">();</span>
+        <span class="p">}</span>
+
+        <span class="k">public</span> <span class="k">function</span> <span class="nf">foo</span><span class="p">()</span>
+        <span class="p">{</span>
+                <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">CI</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">helper</span><span class="p">(</span><span class="s1">&#39;url&#39;</span><span class="p">);</span>
+                <span class="nx">redirect</span><span class="p">();</span>
+        <span class="p">}</span>
+
+        <span class="k">public</span> <span class="k">function</span> <span class="nf">bar</span><span class="p">()</span>
+        <span class="p">{</span>
+                <span class="k">echo</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">CI</span><span class="o">-&gt;</span><span class="na">config</span><span class="o">-&gt;</span><span class="na">item</span><span class="p">(</span><span class="s1">&#39;base_url&#39;</span><span class="p">);</span>
+        <span class="p">}</span>
+
+<span class="p">}</span>
+</pre></div>
+</div>
+</div>
+<div class="section" id="replacing-native-libraries-with-your-versions">
+<h2>Replacing Native Libraries with Your Versions<a class="headerlink" href="#replacing-native-libraries-with-your-versions" title="Permalink to this headline">¶</a></h2>
+<p>Simply by naming your class files identically to a native library will
+cause CodeIgniter to use it instead of the native one. To use this
+feature you must name the file and the class declaration exactly the
+same as the native library. For example, to replace the native Email
+library you’ll create a file named <em>application/libraries/Email.php</em>,
+and declare your class with:</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">class</span> <span class="nc">CI_Email</span> <span class="p">{</span>
+
+<span class="p">}</span>
+</pre></div>
+</div>
+<p>Note that most native classes are prefixed with CI_.</p>
+<p>To load your library you’ll see the standard loading method:</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">library</span><span class="p">(</span><span class="s1">&#39;email&#39;</span><span class="p">);</span>
+</pre></div>
+</div>
+<div class="admonition note">
+<p class="first admonition-title">Note</p>
+<p class="last">At this time the Database classes can not be replaced with
+your own versions.</p>
+</div>
+</div>
+<div class="section" id="extending-native-libraries">
+<h2>Extending Native Libraries<a class="headerlink" href="#extending-native-libraries" title="Permalink to this headline">¶</a></h2>
+<p>If all you need to do is add some functionality to an existing library -
+perhaps add a method or two - then it’s overkill to replace the entire
+library with your version. In this case it’s better to simply extend the
+class. Extending a class is nearly identical to replacing a class with a
+couple exceptions:</p>
+<ul class="simple">
+<li>The class declaration must extend the parent class.</li>
+<li>Your new class name and filename must be prefixed with MY_ (this
+item is configurable. See below.).</li>
+</ul>
+<p>For example, to extend the native Email class you’ll create a file named
+<em>application/libraries/MY_Email.php</em>, and declare your class with:</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">class</span> <span class="nc">MY_Email</span> <span class="k">extends</span> <span class="nx">CI_Email</span> <span class="p">{</span>
+
+<span class="p">}</span>
+</pre></div>
+</div>
+<p>If you need to use a constructor in your class make sure you
+extend the parent constructor:</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">class</span> <span class="nc">MY_Email</span> <span class="k">extends</span> <span class="nx">CI_Email</span> <span class="p">{</span>
+
+        <span class="k">public</span> <span class="k">function</span> <span class="nf">__construct</span><span class="p">(</span><span class="nv">$config</span> <span class="o">=</span> <span class="k">array</span><span class="p">())</span>
+        <span class="p">{</span>
+                <span class="k">parent</span><span class="o">::</span><span class="na">__construct</span><span class="p">(</span><span class="nv">$config</span><span class="p">);</span>
+                <span class="c1">// Your own constructor code</span>
+        <span class="p">}</span>
+
+<span class="p">}</span>
+</pre></div>
+</div>
+<div class="admonition note">
+<p class="first admonition-title">Note</p>
+<p class="last">Not all of the libraries have the same (or any) parameters
+in their constructor. Take a look at the library that you’re
+extending first to see how it should be implemented.</p>
+</div>
+<div class="section" id="loading-your-sub-class">
+<h3>Loading Your Sub-class<a class="headerlink" href="#loading-your-sub-class" title="Permalink to this headline">¶</a></h3>
+<p>To load your sub-class you’ll use the standard syntax normally used. DO
+NOT include your prefix. For example, to load the example above, which
+extends the Email class, you will use:</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">library</span><span class="p">(</span><span class="s1">&#39;email&#39;</span><span class="p">);</span>
+</pre></div>
+</div>
+<p>Once loaded you will use the class variable as you normally would for
+the class you are extending. In the case of the email class all calls
+will use:</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">email</span><span class="o">-&gt;</span><span class="na">some_method</span><span class="p">();</span>
+</pre></div>
+</div>
+</div>
+<div class="section" id="setting-your-own-prefix">
+<h3>Setting Your Own Prefix<a class="headerlink" href="#setting-your-own-prefix" title="Permalink to this headline">¶</a></h3>
+<p>To set your own sub-class prefix, open your
+<em>application/config/config.php</em> file and look for this item:</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;subclass_prefix&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="s1">&#39;MY_&#39;</span><span class="p">;</span>
+</pre></div>
+</div>
+<p>Please note that all native CodeIgniter libraries are prefixed with CI_
+so DO NOT use that as your prefix.</p>
+</div>
+</div>
+</div>
+
+
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