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+<li class="toctree-l2"><a class="reference internal" href="ancillary_classes.html">Creating Ancillary Classes</a></li>
+<li class="toctree-l2 current"><a class="current reference internal" href="#">Hooks - Extending the Framework Core</a></li>
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+
+ <div class="section" id="hooks-extending-the-framework-core">
+<h1>Hooks - Extending the Framework Core<a class="headerlink" href="#hooks-extending-the-framework-core" title="Permalink to this headline">¶</a></h1>
+<p>CodeIgniter’s Hooks feature provides a means to tap into and modify the
+inner workings of the framework without hacking the core files. When
+CodeIgniter runs it follows a specific execution process, diagramed in
+the <a class="reference internal" href="../overview/appflow.html"><span class="doc">Application Flow</span></a> page. There may be
+instances, however, where you’d like to cause some action to take place
+at a particular stage in the execution process. For example, you might
+want to run a script right before your controllers get loaded, or right
+after, or you might want to trigger one of your own scripts in some
+other location.</p>
+<div class="section" id="enabling-hooks">
+<h2>Enabling Hooks<a class="headerlink" href="#enabling-hooks" title="Permalink to this headline">¶</a></h2>
+<p>The hooks feature can be globally enabled/disabled by setting the
+following item in the <strong>application/config/config.php</strong> file:</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;enable_hooks&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="k">TRUE</span><span class="p">;</span>
+</pre></div>
+</div>
+</div>
+<div class="section" id="defining-a-hook">
+<h2>Defining a Hook<a class="headerlink" href="#defining-a-hook" title="Permalink to this headline">¶</a></h2>
+<p>Hooks are defined in the <strong>application/config/hooks.php</strong> file.
+Each hook is specified as an array with this prototype:</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$hook</span><span class="p">[</span><span class="s1">&#39;pre_controller&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span>
+ <span class="s1">&#39;class&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;MyClass&#39;</span><span class="p">,</span>
+ <span class="s1">&#39;function&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;Myfunction&#39;</span><span class="p">,</span>
+ <span class="s1">&#39;filename&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;Myclass.php&#39;</span><span class="p">,</span>
+ <span class="s1">&#39;filepath&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;hooks&#39;</span><span class="p">,</span>
+ <span class="s1">&#39;params&#39;</span> <span class="o">=&gt;</span> <span class="k">array</span><span class="p">(</span><span class="s1">&#39;beer&#39;</span><span class="p">,</span> <span class="s1">&#39;wine&#39;</span><span class="p">,</span> <span class="s1">&#39;snacks&#39;</span><span class="p">)</span>
+<span class="p">);</span>
+</pre></div>
+</div>
+<p><strong>Notes:</strong></p>
+<p>The array index correlates to the name of the particular hook point you
+want to use. In the above example the hook point is pre_controller. A
+list of hook points is found below. The following items should be
+defined in your associative hook array:</p>
+<ul class="simple">
+<li><strong>class</strong> The name of the class you wish to invoke. If you prefer to
+use a procedural function instead of a class, leave this item blank.</li>
+<li><strong>function</strong> The function (or method) name you wish to call.</li>
+<li><strong>filename</strong> The file name containing your class/function.</li>
+<li><strong>filepath</strong> The name of the directory containing your script.
+Note:
+Your script must be located in a directory INSIDE your <em>application/</em>
+directory, so the file path is relative to that directory. For example,
+if your script is located in <em>application/hooks/</em>, you will simply use
+‘hooks’ as your filepath. If your script is located in
+<em>application/hooks/utilities/</em> you will use ‘hooks/utilities’ as your
+filepath. No trailing slash.</li>
+<li><strong>params</strong> Any parameters you wish to pass to your script. This item
+is optional.</li>
+</ul>
+<p>You can also use lambda/anoymous functions (or closures) as hooks, with
+a simpler syntax:</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$hook</span><span class="p">[</span><span class="s1">&#39;post_controller&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="k">function</span><span class="p">()</span>
+<span class="p">{</span>
+ <span class="cm">/* do something here */</span>
+<span class="p">};</span>
+</pre></div>
+</div>
+</div>
+<div class="section" id="multiple-calls-to-the-same-hook">
+<h2>Multiple Calls to the Same Hook<a class="headerlink" href="#multiple-calls-to-the-same-hook" title="Permalink to this headline">¶</a></h2>
+<p>If want to use the same hook point with more than one script, simply
+make your array declaration multi-dimensional, like this:</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$hook</span><span class="p">[</span><span class="s1">&#39;pre_controller&#39;</span><span class="p">][]</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span>
+ <span class="s1">&#39;class&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;MyClass&#39;</span><span class="p">,</span>
+ <span class="s1">&#39;function&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;MyMethod&#39;</span><span class="p">,</span>
+ <span class="s1">&#39;filename&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;Myclass.php&#39;</span><span class="p">,</span>
+ <span class="s1">&#39;filepath&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;hooks&#39;</span><span class="p">,</span>
+ <span class="s1">&#39;params&#39;</span> <span class="o">=&gt;</span> <span class="k">array</span><span class="p">(</span><span class="s1">&#39;beer&#39;</span><span class="p">,</span> <span class="s1">&#39;wine&#39;</span><span class="p">,</span> <span class="s1">&#39;snacks&#39;</span><span class="p">)</span>
+<span class="p">);</span>
+
+<span class="nv">$hook</span><span class="p">[</span><span class="s1">&#39;pre_controller&#39;</span><span class="p">][]</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span>
+ <span class="s1">&#39;class&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;MyOtherClass&#39;</span><span class="p">,</span>
+ <span class="s1">&#39;function&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;MyOtherMethod&#39;</span><span class="p">,</span>
+ <span class="s1">&#39;filename&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;Myotherclass.php&#39;</span><span class="p">,</span>
+ <span class="s1">&#39;filepath&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;hooks&#39;</span><span class="p">,</span>
+ <span class="s1">&#39;params&#39;</span> <span class="o">=&gt;</span> <span class="k">array</span><span class="p">(</span><span class="s1">&#39;red&#39;</span><span class="p">,</span> <span class="s1">&#39;yellow&#39;</span><span class="p">,</span> <span class="s1">&#39;blue&#39;</span><span class="p">)</span>
+<span class="p">);</span>
+</pre></div>
+</div>
+<p>Notice the brackets after each array index:</p>
+<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$hook</span><span class="p">[</span><span class="s1">&#39;pre_controller&#39;</span><span class="p">][]</span>
+</pre></div>
+</div>
+<p>This permits you to have the same hook point with multiple scripts. The
+order you define your array will be the execution order.</p>
+</div>
+<div class="section" id="hook-points">
+<h2>Hook Points<a class="headerlink" href="#hook-points" title="Permalink to this headline">¶</a></h2>
+<p>The following is a list of available hook points.</p>
+<ul class="simple">
+<li><strong>pre_system</strong>
+Called very early during system execution. Only the benchmark and
+hooks class have been loaded at this point. No routing or other
+processes have happened.</li>
+<li><strong>pre_controller</strong>
+Called immediately prior to any of your controllers being called.
+All base classes, routing, and security checks have been done.</li>
+<li><strong>post_controller_constructor</strong>
+Called immediately after your controller is instantiated, but prior
+to any method calls happening.</li>
+<li><strong>post_controller</strong>
+Called immediately after your controller is fully executed.</li>
+<li><strong>display_override</strong>
+Overrides the <code class="docutils literal"><span class="pre">_display()</span></code> method, used to send the finalized page
+to the web browser at the end of system execution. This permits you
+to use your own display methodology. Note that you will need to
+reference the CI superobject with <code class="docutils literal"><span class="pre">$this-&gt;CI</span> <span class="pre">=&amp;</span> <span class="pre">get_instance()</span></code> and
+then the finalized data will be available by calling
+<code class="docutils literal"><span class="pre">$this-&gt;CI-&gt;output-&gt;get_output()</span></code>.</li>
+<li><strong>cache_override</strong>
+Enables you to call your own method instead of the <code class="docutils literal"><span class="pre">_display_cache()</span></code>
+method in the <a class="reference internal" href="../libraries/output.html"><span class="doc">Output Library</span></a>. This permits
+you to use your own cache display mechanism.</li>
+<li><strong>post_system</strong>
+Called after the final rendered page is sent to the browser, at the
+end of system execution after the finalized data is sent to the
+browser.</li>
+</ul>
+</div>
+</div>
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+
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