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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> + + </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> »</li> + + <li><a href="index.html">General Topics</a> »</li> + + <li>Hooks - Extending the Framework Core</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="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">$config</span><span class="p">[</span><span class="s1">'enable_hooks'</span><span class="p">]</span> <span class="o">=</span> <span class="k">TRUE</span><span class="p">;</span> +</pre></div> +</div> +</div> +<div class="section" id="defining-a-hook"> +<h2>Defining a Hook<a class="headerlink" href="#defining-a-hook" title="Permalink to this headline">¶</a></h2> +<p>Hooks are defined in the <strong>application/config/hooks.php</strong> file. +Each hook is specified as an array with this prototype:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$hook</span><span class="p">[</span><span class="s1">'pre_controller'</span><span class="p">]</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span> + <span class="s1">'class'</span> <span class="o">=></span> <span class="s1">'MyClass'</span><span class="p">,</span> + <span class="s1">'function'</span> <span class="o">=></span> <span class="s1">'Myfunction'</span><span class="p">,</span> + <span class="s1">'filename'</span> <span class="o">=></span> <span class="s1">'Myclass.php'</span><span class="p">,</span> + <span class="s1">'filepath'</span> <span class="o">=></span> <span class="s1">'hooks'</span><span class="p">,</span> + <span class="s1">'params'</span> <span class="o">=></span> <span class="k">array</span><span class="p">(</span><span class="s1">'beer'</span><span class="p">,</span> <span class="s1">'wine'</span><span class="p">,</span> <span class="s1">'snacks'</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">$hook</span><span class="p">[</span><span class="s1">'post_controller'</span><span class="p">]</span> <span class="o">=</span> <span class="k">function</span><span class="p">()</span> +<span class="p">{</span> + <span class="cm">/* do something here */</span> +<span class="p">};</span> +</pre></div> +</div> +</div> +<div class="section" id="multiple-calls-to-the-same-hook"> +<h2>Multiple Calls to the Same Hook<a class="headerlink" href="#multiple-calls-to-the-same-hook" title="Permalink to this headline">¶</a></h2> +<p>If want to use the same hook point with more than one script, simply +make your array declaration multi-dimensional, like this:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$hook</span><span class="p">[</span><span class="s1">'pre_controller'</span><span class="p">][]</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span> + <span class="s1">'class'</span> <span class="o">=></span> <span class="s1">'MyClass'</span><span class="p">,</span> + <span class="s1">'function'</span> <span class="o">=></span> <span class="s1">'MyMethod'</span><span class="p">,</span> + <span class="s1">'filename'</span> <span class="o">=></span> <span class="s1">'Myclass.php'</span><span class="p">,</span> + <span class="s1">'filepath'</span> <span class="o">=></span> <span class="s1">'hooks'</span><span class="p">,</span> + <span class="s1">'params'</span> <span class="o">=></span> <span class="k">array</span><span class="p">(</span><span class="s1">'beer'</span><span class="p">,</span> <span class="s1">'wine'</span><span class="p">,</span> <span class="s1">'snacks'</span><span class="p">)</span> +<span class="p">);</span> + +<span class="nv">$hook</span><span class="p">[</span><span class="s1">'pre_controller'</span><span class="p">][]</span> <span class="o">=</span> <span class="k">array</span><span class="p">(</span> + <span class="s1">'class'</span> <span class="o">=></span> <span class="s1">'MyOtherClass'</span><span class="p">,</span> + <span class="s1">'function'</span> <span class="o">=></span> <span class="s1">'MyOtherMethod'</span><span class="p">,</span> + <span class="s1">'filename'</span> <span class="o">=></span> <span class="s1">'Myotherclass.php'</span><span class="p">,</span> + <span class="s1">'filepath'</span> <span class="o">=></span> <span class="s1">'hooks'</span><span class="p">,</span> + <span class="s1">'params'</span> <span class="o">=></span> <span class="k">array</span><span class="p">(</span><span class="s1">'red'</span><span class="p">,</span> <span class="s1">'yellow'</span><span class="p">,</span> <span class="s1">'blue'</span><span class="p">)</span> +<span class="p">);</span> +</pre></div> +</div> +<p>Notice the brackets after each array index:</p> +<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$hook</span><span class="p">[</span><span class="s1">'pre_controller'</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">$this->CI</span> <span class="pre">=&</span> <span class="pre">get_instance()</span></code> and +then the finalized data will be available by calling +<code class="docutils literal"><span class="pre">$this->CI->output->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> + + + </div> + <footer> + + <div class="rst-footer-buttons" role="navigation" aria-label="footer navigation"> + + <a href="autoloader.html" class="btn btn-neutral float-right" title="Auto-loading Resources">Next <span class="fa fa-arrow-circle-right"></span></a> + + + <a href="ancillary_classes.html" class="btn btn-neutral" title="Creating Ancillary Classes"><span class="fa fa-arrow-circle-left"></span> Previous</a> + + </div> + + + <hr/> + + <div role="contentinfo"> + <p> + © Copyright 2014 - 2018, British Columbia Institute of Technology. + Last updated on Mar 22, 2018. + </p> + </div> + + Built with <a href="http://sphinx-doc.org/">Sphinx</a> using a <a href="https://github.com/snide/sphinx_rtd_theme">theme</a> provided by <a href="https://readthedocs.org">Read the Docs</a>. + +</footer> + </div> + </div> + + </section> + + </div> + + + + + + <script type="text/javascript"> + var DOCUMENTATION_OPTIONS = { + URL_ROOT:'../', + VERSION:'3.1.8', + COLLAPSE_INDEX:false, + FILE_SUFFIX:'.html', + HAS_SOURCE: false + }; + </script> + <script type="text/javascript" src="../_static/jquery.js"></script> + <script type="text/javascript" src="../_static/underscore.js"></script> + <script type="text/javascript" src="../_static/doctools.js"></script> + + + + + + <script type="text/javascript" src="../_static/js/theme.js"></script> + + + + + <script type="text/javascript"> + jQuery(function () { + SphinxRtdTheme.StickyNav.enable(); + }); + </script> + + +</body> +</html>
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