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<div class="section" id="controller-filters">
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<h1>Controller Filters<a class="headerlink" href="#controller-filters" title="Permalink to this headline">¶</a></h1>
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<div class="contents local topic" id="contents">
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<ul class="simple">
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<li><a class="reference internal" href="#creating-a-filter" id="id1">Creating a Filter</a><ul>
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<li><a class="reference internal" href="#before-filters" id="id2">Before Filters</a></li>
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<li><a class="reference internal" href="#after-filters" id="id3">After Filters</a></li>
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</ul>
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</li>
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<li><a class="reference internal" href="#configuring-filters" id="id4">Configuring Filters</a><ul>
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<li><a class="reference internal" href="#aliases" id="id5">$aliases</a></li>
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<li><a class="reference internal" href="#globals" id="id6">$globals</a></li>
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<li><a class="reference internal" href="#methods" id="id7">$methods</a></li>
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<li><a class="reference internal" href="#filters" id="id8">$filters</a></li>
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</ul>
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</li>
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<li><a class="reference internal" href="#provided-filters" id="id9">Provided Filters</a></li>
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</ul>
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</div>
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<p>Controller Filters allow you to perform actions either before or after the controllers execute. Unlike <a class="reference internal" href="../extending/events.html"><span class="doc">events</span></a>,
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you can very simply choose which URI’s in your application have the filters applied to them. Incoming filters may
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modify the Request, while after filters can act on and even modify the Response, allowing for a lot of flexibility
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and power. Some common examples of tasks that might be performed with filters are:</p>
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<ul class="simple">
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<li>Performing CSRF protection on the incoming requests</li>
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<li>Restricting areas of your site based upon their Role</li>
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<li>Perform rate limiting on certain endpoints</li>
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<li>Display a “Down for Maintenance” page</li>
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<li>Perform automatic content negotiation</li>
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<li>and more..</li>
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</ul>
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<div class="section" id="creating-a-filter">
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<h2><a class="toc-backref" href="#id1">Creating a Filter</a><a class="headerlink" href="#creating-a-filter" title="Permalink to this headline">¶</a></h2>
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<p>Filters are simple classes that implement <code class="docutils literal"><span class="pre">CodeIgniter\Filters\FilterInterface</span></code>.
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They contain two methods: <code class="docutils literal"><span class="pre">before()</span></code> and <code class="docutils literal"><span class="pre">after()</span></code> which hold the code that
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will run before and after the controller respectively. Your class must contain both methods
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but may leave the methods empty if they are not needed. A skeleton filter class looks like:</p>
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<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="o"><?</span><span class="nx">php</span> <span class="k">namespace</span> <span class="nx">App\Filters</span><span class="p">;</span>
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<span class="k">use</span> <span class="nx">CodeIgniter\HTTP\RequestInterface</span><span class="p">;</span>
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<span class="k">use</span> <span class="nx">CodeIgniter\HTTP\ResponseInterface</span><span class="p">;</span>
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<span class="k">use</span> <span class="nx">CodeIgniter\Filters\FilterInterface</span><span class="p">;</span>
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<span class="k">class</span> <span class="nc">MyFilter</span> <span class="k">implements</span> <span class="nx">FilterInterface</span>
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<span class="p">{</span>
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<span class="k">public</span> <span class="k">function</span> <span class="nf">before</span><span class="p">(</span><span class="nx">RequestInterface</span> <span class="nv">$request</span><span class="p">)</span>
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<span class="p">{</span>
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<span class="c1">// Do something here</span>
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<span class="p">}</span>
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<span class="c1">//--------------------------------------------------------------------</span>
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<span class="k">public</span> <span class="k">function</span> <span class="nf">after</span><span class="p">(</span><span class="nx">RequestInterface</span> <span class="nv">$request</span><span class="p">,</span> <span class="nx">ResponseInterface</span> <span class="nv">$response</span><span class="p">)</span>
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<span class="p">{</span>
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<span class="c1">// Do something here</span>
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<span class="p">}</span>
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<span class="p">}</span>
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</pre></div>
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</div>
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<div class="section" id="before-filters">
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<h3><a class="toc-backref" href="#id2">Before Filters</a><a class="headerlink" href="#before-filters" title="Permalink to this headline">¶</a></h3>
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<p>From any filter, you can return the <code class="docutils literal"><span class="pre">$request</span></code> object and it will replace the current Request, allowing you
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to make changes that will still be present when the controller executes.</p>
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<p>Since before filters are executed prior to your controller being executed, you may at times want to stop the
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actions in the controller from happening. You can do this by passing back anything that is not the request object.
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This is typically used to peform redirects, like in this example:</p>
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<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">public</span> <span class="k">function</span> <span class="nf">before</span><span class="p">(</span><span class="nx">RequestInterface</span> <span class="nv">$request</span><span class="p">)</span>
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<span class="p">{</span>
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<span class="nv">$auth</span> <span class="o">=</span> <span class="nx">service</span><span class="p">(</span><span class="s1">'auth'</span><span class="p">);</span>
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<span class="k">if</span> <span class="p">(</span><span class="o">!</span> <span class="nv">$auth</span><span class="o">-></span><span class="na">isLoggedIn</span><span class="p">())</span>
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<span class="p">{</span>
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<span class="k">return</span> <span class="nx">redirect</span><span class="p">(</span><span class="s1">'login'</span><span class="p">);</span>
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<span class="p">}</span>
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<span class="p">}</span>
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</pre></div>
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</div>
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<p>If a Response instance is returned, the Response will be sent back to the client and script execution will stop.
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This can be useful for implementing rate limiting for API’s. See <strong>app/Filters/Throttle.php</strong> for an
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example.</p>
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</div>
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<div class="section" id="after-filters">
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<h3><a class="toc-backref" href="#id3">After Filters</a><a class="headerlink" href="#after-filters" title="Permalink to this headline">¶</a></h3>
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<p>After filters are nearly identical to before filters, except that you can only return the <code class="docutils literal"><span class="pre">$response</span></code> object,
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and you cannot stop script execution. This does allow you to modify the final output, or simply do something with
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the final output. This could be used to ensure certain security headers were set the correct way, or to cache
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the final output, or even to filter the final output with a bad words filter.</p>
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</div>
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</div>
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<div class="section" id="configuring-filters">
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<h2><a class="toc-backref" href="#id4">Configuring Filters</a><a class="headerlink" href="#configuring-filters" title="Permalink to this headline">¶</a></h2>
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<p>Once you’ve created your filters, you need to configure when they get run. This is done in <code class="docutils literal"><span class="pre">app/Config/Filters.php</span></code>.
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This file contains four properties that allow you to configure exactly when the filters run.</p>
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<div class="section" id="aliases">
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<h3><a class="toc-backref" href="#id5">$aliases</a><a class="headerlink" href="#aliases" title="Permalink to this headline">¶</a></h3>
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<p>The <code class="docutils literal"><span class="pre">$aliases</span></code> array is used to associate a simple name with one or more fully-qualified class names that are the
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filters to run:</p>
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<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">public</span> <span class="nv">$aliases</span> <span class="o">=</span> <span class="p">[</span>
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<span class="s1">'csrf'</span> <span class="o">=></span> <span class="nx">\CodeIgniter\Filters\CSRF</span><span class="o">::</span><span class="na">class</span>
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<span class="p">];</span>
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</pre></div>
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</div>
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<p>Aliases are mandatory and if you try to use a full class name later, the system will throw an error. Defining them
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in this way makes it simple to switch out the class used. Great for when you decided you need to change to a
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different authentication system since you only change the filter’s class and you’re done.</p>
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<p>You can combine multiple filters into one alias, making complex sets of filters simple to apply:</p>
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<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">public</span> <span class="nv">$aliases</span> <span class="o">=</span> <span class="p">[</span>
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<span class="s1">'apiPrep'</span> <span class="o">=></span> <span class="p">[</span>
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<span class="nx">\App\Filters\Negotiate</span><span class="o">::</span><span class="na">class</span><span class="p">,</span>
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<span class="nx">\App\Filters\ApiAuth</span><span class="o">::</span><span class="na">class</span>
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<span class="p">]</span>
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<span class="p">];</span>
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</pre></div>
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</div>
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<p>You should define as many aliases as you need.</p>
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</div>
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<div class="section" id="globals">
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<h3><a class="toc-backref" href="#id6">$globals</a><a class="headerlink" href="#globals" title="Permalink to this headline">¶</a></h3>
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<p>The second section allows you to define any filters that should be applied to every request made by the framework.
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You should take care with how many you use here, since it could have performance implications to have too many
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run on every request. Filters can be specified by adding their alias to either the before or after array:</p>
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<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">public</span> <span class="nv">$globals</span> <span class="o">=</span> <span class="p">[</span>
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<span class="s1">'before'</span> <span class="o">=></span> <span class="p">[</span>
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<span class="s1">'csrf'</span>
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<span class="p">],</span>
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<span class="s1">'after'</span> <span class="o">=></span> <span class="p">[]</span>
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<span class="p">];</span>
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</pre></div>
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</div>
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<p>There are times where you want to apply a filter to almost every request, but have a few that should be left alone.
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|
One common example is if you need to exclude a few URI’s from the CSRF protection filter to allow requests from
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|
third-party websites to hit one or two specific URI’s, while keeping the rest of them protected. To do this, add
|
|
an array with the ‘except’ key and a uri to match as the value alongside the alias:</p>
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|
<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">public</span> <span class="nv">$globals</span> <span class="o">=</span> <span class="p">[</span>
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<span class="s1">'before'</span> <span class="o">=></span> <span class="p">[</span>
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<span class="s1">'csrf'</span> <span class="o">=></span> <span class="p">[</span><span class="s1">'except'</span> <span class="o">=></span> <span class="s1">'api/*'</span><span class="p">]</span>
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<span class="p">],</span>
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<span class="s1">'after'</span> <span class="o">=></span> <span class="p">[]</span>
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<span class="p">];</span>
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</pre></div>
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</div>
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<p>Any place you can use a URI in the filter settings, you can use a regular expression or, like in this example, use
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an asterisk for a wildcard that will match all characters after that. In this example, any URL’s starting with <code class="docutils literal"><span class="pre">api/</span></code>
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would be exempted from CSRF protection, but the site’s forms would all be protected. If you need to specify multiple
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URI’s you can use an array of URI patterns:</p>
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<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">public</span> <span class="nv">$globals</span> <span class="o">=</span> <span class="p">[</span>
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<span class="s1">'before'</span> <span class="o">=></span> <span class="p">[</span>
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<span class="s1">'csrf'</span> <span class="o">=></span> <span class="p">[</span><span class="s1">'except'</span> <span class="o">=></span> <span class="p">[</span><span class="s1">'foo/*'</span><span class="p">,</span> <span class="s1">'bar/*'</span><span class="p">]]</span>
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<span class="p">],</span>
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<span class="s1">'after'</span> <span class="o">=></span> <span class="p">[]</span>
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<span class="p">];</span>
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</pre></div>
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</div>
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</div>
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<div class="section" id="methods">
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<h3><a class="toc-backref" href="#id7">$methods</a><a class="headerlink" href="#methods" title="Permalink to this headline">¶</a></h3>
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<p>You can apply filters to all requests of a certain HTTP method, like POST, GET, PUT, etc. In this array, you would
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specify the method name in lowercase. It’s value would be an array of filters to run. Unlike the <code class="docutils literal"><span class="pre">$globals</span></code> or the
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<code class="docutils literal"><span class="pre">$filters</span></code> properties, these will only run as before filters:</p>
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<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">public</span> <span class="nv">$methods</span> <span class="o">=</span> <span class="p">[</span>
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<span class="s1">'post'</span> <span class="o">=></span> <span class="p">[</span><span class="s1">'foo'</span><span class="p">,</span> <span class="s1">'bar'</span><span class="p">],</span>
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<span class="s1">'get'</span> <span class="o">=></span> <span class="p">[</span><span class="s1">'baz'</span><span class="p">]</span>
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<span class="p">]</span>
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</pre></div>
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</div>
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<p>In addition to the standard HTTP methods, this also supports two special cases: ‘cli’, and ‘ajax’. The names are
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self-explanatory here, but ‘cli’ would apply to all requests that were run from the command line, while ‘ajax’
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would apply to every AJAX request.</p>
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</div>
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<div class="section" id="filters">
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<h3><a class="toc-backref" href="#id8">$filters</a><a class="headerlink" href="#filters" title="Permalink to this headline">¶</a></h3>
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<p>This property is an array of filter aliases. For each alias you can specify before and after arrays that contain
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a list of URI patterns that filter should apply to:</p>
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<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">public</span> <span class="nx">filters</span> <span class="o">=</span> <span class="p">[</span>
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<span class="s1">'foo'</span> <span class="o">=></span> <span class="p">[</span><span class="s1">'before'</span> <span class="o">=></span> <span class="p">[</span><span class="s1">'admin/*'</span><span class="p">],</span> <span class="s1">'after'</span> <span class="o">=></span> <span class="p">[</span><span class="s1">'users/*'</span><span class="p">]],</span>
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<span class="s1">'bar'</span> <span class="o">=></span> <span class="p">[</span><span class="s1">'before'</span> <span class="o">=></span> <span class="p">[</span><span class="s1">'api/*'</span><span class="p">,</span> <span class="s1">'admin/*'</span><span class="p">]]</span>
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<span class="p">];</span>
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</pre></div>
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</div>
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</div>
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</div>
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<div class="section" id="provided-filters">
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<h2><a class="toc-backref" href="#id9">Provided Filters</a><a class="headerlink" href="#provided-filters" title="Permalink to this headline">¶</a></h2>
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<p>Three filters are bundled with CodeIgniter4: Honeypot, Security, and DebugToolbar.</p>
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</div>
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