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  <div class="section" id="controllers">
<h1>Controllers<a class="headerlink" href="#controllers" title="Permalink to this headline">¶</a></h1>
<p>Controllers are the heart of your application, as they determine how HTTP requests should be handled.</p>
<div class="contents local topic" id="contents">
<ul class="simple">
<li><a class="reference internal" href="#what-is-a-controller" id="id1">What is a Controller?</a></li>
<li><a class="reference internal" href="#let-s-try-it-hello-world" id="id2">Let’s try it: Hello World!</a></li>
<li><a class="reference internal" href="#methods" id="id3">Methods</a></li>
<li><a class="reference internal" href="#passing-uri-segments-to-your-methods" id="id4">Passing URI Segments to your methods</a></li>
<li><a class="reference internal" href="#defining-a-default-controller" id="id5">Defining a Default Controller</a></li>
<li><a class="reference internal" href="#remapping-method-calls" id="id6">Remapping Method Calls</a></li>
<li><a class="reference internal" href="#private-methods" id="id7">Private methods</a></li>
<li><a class="reference internal" href="#organizing-your-controllers-into-sub-directories" id="id8">Organizing Your Controllers into Sub-directories</a></li>
<li><a class="reference internal" href="#included-properties" id="id9">Included Properties</a><ul>
<li><a class="reference internal" href="#helpers" id="id10">Helpers</a></li>
</ul>
</li>
<li><a class="reference internal" href="#validating-data" id="id11">Validating data</a></li>
<li><a class="reference internal" href="#that-s-it" id="id12">That’s it!</a></li>
</ul>
</div>
<div class="section" id="what-is-a-controller">
<h2><a class="toc-backref" href="#id1">What is a Controller?</a><a class="headerlink" href="#what-is-a-controller" title="Permalink to this headline">¶</a></h2>
<p>A Controller is simply a class file that is named in a way that it can be associated with a URI.</p>
<p>Consider this URI:</p>
<div class="highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="nx">example</span><span class="o">.</span><span class="nx">com</span><span class="o">/</span><span class="nx">index</span><span class="o">.</span><span class="nx">php</span><span class="o">/</span><span class="nx">helloworld</span><span class="o">/</span>
</pre></div>
</div>
<p>In the above example, CodeIgniter would attempt to find a controller named Helloworld.php and load it.</p>
<p><strong>When a controller’s name matches the first segment of a URI, it will be loaded.</strong></p>
</div>
<div class="section" id="let-s-try-it-hello-world">
<h2><a class="toc-backref" href="#id2">Let’s try it: Hello World!</a><a class="headerlink" href="#let-s-try-it-hello-world" title="Permalink to this headline">¶</a></h2>
<p>Let’s create a simple controller so you can see it in action. Using your text editor, create a file called Helloworld.php,
and put the following code in it. You will notice that the Helloworld Controller is extending the BaseController. you can
also extend the CodeIgniter\Controller if you do not need the functionality of the BaseController.</p>
<p>The BaseController provides a convenient place for loading components and performing functions that are needed by all your
controllers. You can extend this class in any new controller.</p>
<p>For security reasons be sure to declare any new utility methods as protected or private.:</p>
<div class="highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="o">&lt;?</span><span class="nx">php</span>

<span class="k">namespace</span> <span class="nx">App\Controllers</span><span class="p">;</span>

<span class="k">class</span> <span class="nc">Helloworld</span> <span class="k">extends</span> <span class="nx">BaseController</span>
<span class="p">{</span>
    <span class="k">public</span> <span class="k">function</span> <span class="nf">index</span><span class="p">()</span>
    <span class="p">{</span>
        <span class="k">echo</span> <span class="s1">&#39;Hello World!&#39;</span><span class="p">;</span>
    <span class="p">}</span>
<span class="p">}</span>
</pre></div>
</div>
<p>Then save the file to your <strong>/app/Controllers/</strong> directory.</p>
<div class="admonition important">
<p class="first admonition-title">Important</p>
<p class="last">The file must be called ‘Helloworld.php’, with a capital ‘H’.</p>
</div>
<p>Now visit your site using a URL similar to this:</p>
<div class="highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="nx">example</span><span class="o">.</span><span class="nx">com</span><span class="o">/</span><span class="nx">index</span><span class="o">.</span><span class="nx">php</span><span class="o">/</span><span class="nx">helloworld</span>
</pre></div>
</div>
<p>If you did it right you should see:</p>
<div class="highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="nx">Hello</span> <span class="nx">World</span><span class="o">!</span>
</pre></div>
</div>
<div class="admonition important">
<p class="first admonition-title">Important</p>
<p class="last">Controller class names MUST start with an uppercase letter and ONLY the first character can be uppercase.</p>
</div>
<p>This is valid:</p>
<div class="highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="o">&lt;?</span><span class="nx">php</span>

<span class="k">namespace</span> <span class="nx">App\Controllers</span><span class="p">;</span>


<span class="k">class</span> <span class="nc">Helloworld</span> <span class="k">extends</span> <span class="nx">BaseController</span>
<span class="p">{</span>

<span class="p">}</span>
</pre></div>
</div>
<p>This is <strong>not</strong> valid:</p>
<div class="highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="o">&lt;?</span><span class="nx">php</span>

<span class="k">namespace</span> <span class="nx">App\Controllers</span><span class="p">;</span>

<span class="k">class</span> <span class="nc">helloworld</span> <span class="k">extends</span> <span class="nx">BaseController</span>
<span class="p">{</span>

<span class="p">}</span>
</pre></div>
</div>
<p>This is <strong>not</strong> valid:</p>
<div class="highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="o">&lt;?</span><span class="nx">php</span>

<span class="k">namespace</span> <span class="nx">App\Controllers</span><span class="p">;</span>

<span class="k">class</span> <span class="nc">HelloWorld</span> <span class="k">extends</span> <span class="nx">BaseController</span>
<span class="p">{</span>

<span class="p">}</span>
</pre></div>
</div>
<p>Also, always make sure your controller extends the parent controller
class so that it can inherit all its methods.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p>The system will attempt to match the URI against Controllers by matching each segment against
folders/files in APPPATH/Controllers, when a match wasn’t found against defined routes.
That’s why your folders/files MUST start with a capital letter and the rest MUST be lowercase.
If you want another naming convention you need to manually define it using the
<a class="reference internal" href="routing.html"><span class="doc">URI Routing</span></a> feature.</p>
<p>Here is an example based on PSR-4: Autoloader:</p>
<div class="last highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="nx">\</span><span class="o">&lt;</span><span class="nx">NamespaceName</span><span class="o">&gt;</span><span class="p">(</span><span class="nx">\</span><span class="o">&lt;</span><span class="nx">SubNamespaceNames</span><span class="o">&gt;</span><span class="p">)</span><span class="o">*</span><span class="nx">\</span><span class="o">&lt;</span><span class="nx">ClassName</span><span class="o">&gt;</span>

<span class="nv">$routes</span><span class="o">-&gt;</span><span class="na">get</span><span class="p">(</span><span class="s1">&#39;helloworld&#39;</span><span class="p">,</span> <span class="s1">&#39;App\Controllers\HelloWorld::index&#39;</span><span class="p">);</span>
</pre></div>
</div>
</div>
</div>
<div class="section" id="methods">
<h2><a class="toc-backref" href="#id3">Methods</a><a class="headerlink" href="#methods" title="Permalink to this headline">¶</a></h2>
<p>In the above example, the method name is <code class="docutils literal notranslate"><span class="pre">index()</span></code>. The “index” method
is always loaded by default if the <strong>second segment</strong> of the URI is
empty. Another way to show your “Hello World” message would be this:</p>
<div class="highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="nx">example</span><span class="o">.</span><span class="nx">com</span><span class="o">/</span><span class="nx">index</span><span class="o">.</span><span class="nx">php</span><span class="o">/</span><span class="nx">helloworld</span><span class="o">/</span><span class="nx">index</span><span class="o">/</span>
</pre></div>
</div>
<p><strong>The second segment of the URI determines which method in the
controller gets called.</strong></p>
<p>Let’s try it. Add a new method to your controller:</p>
<div class="highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="o">&lt;?</span><span class="nx">php</span>

<span class="k">namespace</span> <span class="nx">App\Controllers</span><span class="p">;</span>

<span class="k">class</span> <span class="nc">Helloworld</span> <span class="k">extends</span> <span class="nx">BaseController</span>
<span class="p">{</span>
    <span class="k">public</span> <span class="k">function</span> <span class="nf">index</span><span class="p">()</span>
    <span class="p">{</span>
        <span class="k">echo</span> <span class="s1">&#39;Hello World!&#39;</span><span class="p">;</span>
    <span class="p">}</span>

    <span class="k">public</span> <span class="k">function</span> <span class="nf">comment</span><span class="p">()</span>
    <span class="p">{</span>
        <span class="k">echo</span> <span class="s1">&#39;I am not flat!&#39;</span><span class="p">;</span>
    <span class="p">}</span>
<span class="p">}</span>
</pre></div>
</div>
<p>Now load the following URL to see the comment method:</p>
<div class="highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="nx">example</span><span class="o">.</span><span class="nx">com</span><span class="o">/</span><span class="nx">index</span><span class="o">.</span><span class="nx">php</span><span class="o">/</span><span class="nx">helloworld</span><span class="o">/</span><span class="nx">comment</span><span class="o">/</span>
</pre></div>
</div>
<p>You should see your new message.</p>
</div>
<div class="section" id="passing-uri-segments-to-your-methods">
<h2><a class="toc-backref" href="#id4">Passing URI Segments to your methods</a><a class="headerlink" href="#passing-uri-segments-to-your-methods" title="Permalink to this headline">¶</a></h2>
<p>If your URI contains more than two segments they will be passed to your
method as parameters.</p>
<p>For example, let’s say you have a URI like this:</p>
<div class="highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="nx">example</span><span class="o">.</span><span class="nx">com</span><span class="o">/</span><span class="nx">index</span><span class="o">.</span><span class="nx">php</span><span class="o">/</span><span class="nx">products</span><span class="o">/</span><span class="nx">shoes</span><span class="o">/</span><span class="nx">sandals</span><span class="o">/</span><span class="mi">123</span>
</pre></div>
</div>
<p>Your method will be passed URI segments 3 and 4 (“sandals” and “123”):</p>
<div class="highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="o">&lt;?</span><span class="nx">php</span>

<span class="k">namespace</span> <span class="nx">App\Controllers</span><span class="p">;</span>

<span class="k">class</span> <span class="nc">Products</span> <span class="k">extends</span> <span class="nx">BaseController</span>
<span class="p">{</span>
    <span class="k">public</span> <span class="k">function</span> <span class="nf">shoes</span><span class="p">(</span><span class="nv">$sandals</span><span class="p">,</span> <span class="nv">$id</span><span class="p">)</span>
    <span class="p">{</span>
        <span class="k">echo</span> <span class="nv">$sandals</span><span class="p">;</span>
        <span class="k">echo</span> <span class="nv">$id</span><span class="p">;</span>
    <span class="p">}</span>
<span class="p">}</span>
</pre></div>
</div>
<div class="admonition important">
<p class="first admonition-title">Important</p>
<p class="last">If you are using the <a class="reference internal" href="routing.html"><span class="doc">URI Routing</span></a>
feature, the segments passed to your method will be the re-routed
ones.</p>
</div>
</div>
<div class="section" id="defining-a-default-controller">
<h2><a class="toc-backref" href="#id5">Defining a Default Controller</a><a class="headerlink" href="#defining-a-default-controller" title="Permalink to this headline">¶</a></h2>
<p>CodeIgniter can be told to load a default controller when a URI is not
present, as will be the case when only your site root URL is requested. Let’s try it
with the Helloworld controller.</p>
<p>To specify a default controller open your <strong>app/Config/Routes.php</strong>
file and set this variable:</p>
<div class="highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="nv">$routes</span><span class="o">-&gt;</span><span class="na">setDefaultController</span><span class="p">(</span><span class="s1">&#39;Helloworld&#39;</span><span class="p">);</span>
</pre></div>
</div>
<p>Where ‘Helloworld’ is the name of the controller class you want to be used.</p>
<p>A few lines further down <strong>Routes.php</strong> in the “Route Definitions” section comment out the line:</p>
<div class="highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="nv">$routes</span><span class="o">-&gt;</span><span class="na">get</span><span class="p">(</span><span class="s1">&#39;/&#39;</span><span class="p">,</span> <span class="s1">&#39;Home::index&#39;</span><span class="p">);</span>
</pre></div>
</div>
<p>If you now browse to your site without specifying any URI segments you’ll
see the “Hello World” message.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">The line <code class="docutils literal notranslate"><span class="pre">$routes-&gt;get('/',</span> <span class="pre">'Home::index');</span></code> is an optimization that you will want to use in a “real-world” app. But for demonstration purposes we don’t want to use that feature. <code class="docutils literal notranslate"><span class="pre">$routes-&gt;get()</span></code> is explained in <a class="reference internal" href="routing.html"><span class="doc">URI Routing</span></a></p>
</div>
<p>For more information, please refer to the “Routes Configuration Options” section of the
<a class="reference internal" href="routing.html"><span class="doc">URI Routing</span></a> documentation.</p>
</div>
<div class="section" id="remapping-method-calls">
<h2><a class="toc-backref" href="#id6">Remapping Method Calls</a><a class="headerlink" href="#remapping-method-calls" title="Permalink to this headline">¶</a></h2>
<p>As noted above, the second segment of the URI typically determines which
method in the controller gets called. CodeIgniter permits you to override
this behavior through the use of the <code class="docutils literal notranslate"><span class="pre">_remap()</span></code> method:</p>
<div class="highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="k">public</span> <span class="k">function</span> <span class="nf">_remap</span><span class="p">()</span>
<span class="p">{</span>
    <span class="c1">// Some code here...</span>
<span class="p">}</span>
</pre></div>
</div>
<div class="admonition important">
<p class="first admonition-title">Important</p>
<p class="last">If your controller contains a method named _remap(),
it will <strong>always</strong> get called regardless of what your URI contains. It
overrides the normal behavior in which the URI determines which method
is called, allowing you to define your own method routing rules.</p>
</div>
<p>The overridden method call (typically the second segment of the URI) will
be passed as a parameter to the <code class="docutils literal notranslate"><span class="pre">_remap()</span></code> method:</p>
<div class="highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="k">public</span> <span class="k">function</span> <span class="nf">_remap</span><span class="p">(</span><span class="nv">$method</span><span class="p">)</span>
<span class="p">{</span>
    <span class="k">if</span> <span class="p">(</span><span class="nv">$method</span> <span class="o">===</span> <span class="s1">&#39;some_method&#39;</span><span class="p">)</span>
    <span class="p">{</span>
        <span class="k">return</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="nv">$method</span><span class="p">();</span>
    <span class="p">}</span>
    <span class="k">else</span>
    <span class="p">{</span>
        <span class="k">return</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">default_method</span><span class="p">();</span>
    <span class="p">}</span>
<span class="p">}</span>
</pre></div>
</div>
<p>Any extra segments after the method name are passed into <code class="docutils literal notranslate"><span class="pre">_remap()</span></code>. These parameters can be passed to the method
to emulate CodeIgniter’s default behavior.</p>
<p>Example:</p>
<div class="highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="k">public</span> <span class="k">function</span> <span class="nf">_remap</span><span class="p">(</span><span class="nv">$method</span><span class="p">,</span> <span class="o">...</span><span class="nv">$params</span><span class="p">)</span>
<span class="p">{</span>
    <span class="nv">$method</span> <span class="o">=</span> <span class="s1">&#39;process_&#39;</span><span class="o">.</span><span class="nv">$method</span><span class="p">;</span>
    <span class="k">if</span> <span class="p">(</span><span class="nb">method_exists</span><span class="p">(</span><span class="nv">$this</span><span class="p">,</span> <span class="nv">$method</span><span class="p">))</span>
    <span class="p">{</span>
        <span class="k">return</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="nv">$method</span><span class="p">(</span><span class="o">...</span><span class="nv">$params</span><span class="p">);</span>
    <span class="p">}</span>
    <span class="k">throw</span> <span class="nx">\CodeIgniter\Exceptions\PageNotFoundException</span><span class="o">::</span><span class="na">forPageNotFound</span><span class="p">();</span>
<span class="p">}</span>
</pre></div>
</div>
</div>
<div class="section" id="private-methods">
<h2><a class="toc-backref" href="#id7">Private methods</a><a class="headerlink" href="#private-methods" title="Permalink to this headline">¶</a></h2>
<p>In some cases, you may want certain methods hidden from public access.
To achieve this, simply declare the method as private or protected.
That will prevent it from being served by a URL request. For example,
if you were to define a method like this for the <cite>Helloworld</cite> controller:</p>
<div class="highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="k">protected</span> <span class="k">function</span> <span class="nf">utility</span><span class="p">()</span>
<span class="p">{</span>
    <span class="c1">// some code</span>
<span class="p">}</span>
</pre></div>
</div>
<p>then trying to access it using the following URL will not work:</p>
<div class="highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="nx">example</span><span class="o">.</span><span class="nx">com</span><span class="o">/</span><span class="nx">index</span><span class="o">.</span><span class="nx">php</span><span class="o">/</span><span class="nx">helloworld</span><span class="o">/</span><span class="nx">utility</span><span class="o">/</span>
</pre></div>
</div>
</div>
<div class="section" id="organizing-your-controllers-into-sub-directories">
<h2><a class="toc-backref" href="#id8">Organizing Your Controllers into Sub-directories</a><a class="headerlink" href="#organizing-your-controllers-into-sub-directories" title="Permalink to this headline">¶</a></h2>
<p>If you are building a large application you might want to hierarchically
organize or structure your controllers into sub-directories. CodeIgniter
permits you to do this.</p>
<p>Simply create sub-directories under the main <em>app/Controllers/</em>
one and place your controller classes within them.</p>
<div class="admonition important">
<p class="first admonition-title">Important</p>
<p class="last">Folder names MUST start with an uppercase letter and ONLY the first character can be uppercase.</p>
</div>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p>When using this feature the first segment of your URI must
specify the folder. For example, let’s say you have a controller located here:</p>
<div class="highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="nx">app</span><span class="o">/</span><span class="nx">Controllers</span><span class="o">/</span><span class="nx">Products</span><span class="o">/</span><span class="nx">Shoes</span><span class="o">.</span><span class="nx">php</span>
</pre></div>
</div>
<p>To call the above controller your URI will look something like this:</p>
<div class="last highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="nx">example</span><span class="o">.</span><span class="nx">com</span><span class="o">/</span><span class="nx">index</span><span class="o">.</span><span class="nx">php</span><span class="o">/</span><span class="nx">products</span><span class="o">/</span><span class="nx">shoes</span><span class="o">/</span><span class="nx">show</span><span class="o">/</span><span class="mi">123</span>
</pre></div>
</div>
</div>
<p>Each of your sub-directories may contain a default controller which will be
called if the URL contains <em>only</em> the sub-directory. Simply put a controller
in there that matches the name of your ‘default_controller’ as specified in
your <em>app/Config/Routes.php</em> file.</p>
<p>CodeIgniter also permits you to remap your URIs using its <a class="reference internal" href="routing.html"><span class="doc">URI Routing</span></a> feature.</p>
</div>
<div class="section" id="included-properties">
<h2><a class="toc-backref" href="#id9">Included Properties</a><a class="headerlink" href="#included-properties" title="Permalink to this headline">¶</a></h2>
<p>Every controller you create should extend <code class="docutils literal notranslate"><span class="pre">CodeIgniter\Controller</span></code> class.
This class provides several features that are available to all of your controllers.</p>
<p><strong>Request Object</strong></p>
<p>The application’s main <a class="reference internal" href="request.html"><span class="doc">Request Instance</span></a> is always available
as a class property, <code class="docutils literal notranslate"><span class="pre">$this-&gt;request</span></code>.</p>
<p><strong>Response Object</strong></p>
<p>The application’s main <a class="reference internal" href="../outgoing/response.html"><span class="doc">Response Instance</span></a> is always available
as a class property, <code class="docutils literal notranslate"><span class="pre">$this-&gt;response</span></code>.</p>
<p><strong>Logger Object</strong></p>
<p>An instance of the <a class="reference internal" href="../general/logging.html"><span class="doc">Logger</span></a> class is available as a class property,
<code class="docutils literal notranslate"><span class="pre">$this-&gt;logger</span></code>.</p>
<p><strong>forceHTTPS</strong></p>
<p>A convenience method for forcing a method to be accessed via HTTPS is available within all
controllers:</p>
<div class="highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="k">if</span> <span class="p">(</span><span class="o">!</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">request</span><span class="o">-&gt;</span><span class="na">isSecure</span><span class="p">())</span>
<span class="p">{</span>
    <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">forceHTTPS</span><span class="p">();</span>
<span class="p">}</span>
</pre></div>
</div>
<p>By default, and in modern browsers that support the HTTP Strict Transport Security header, this
call should force the browser to convert non-HTTPS calls to HTTPS calls for one year. You can
modify this by passing the duration (in seconds) as the first parameter:</p>
<div class="highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="k">if</span> <span class="p">(</span><span class="o">!</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">request</span><span class="o">-&gt;</span><span class="na">isSecure</span><span class="p">())</span>
<span class="p">{</span>
    <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">forceHTTPS</span><span class="p">(</span><span class="mi">31536000</span><span class="p">);</span>    <span class="c1">// one year</span>
<span class="p">}</span>
</pre></div>
</div>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">A number of <a class="reference internal" href="../general/common_functions.html"><span class="doc">time-based constants</span></a> are always available for you to use, including YEAR, MONTH, and more.</p>
</div>
<div class="section" id="helpers">
<h3><a class="toc-backref" href="#id10">Helpers</a><a class="headerlink" href="#helpers" title="Permalink to this headline">¶</a></h3>
<p>You can define an array of helper files as a class property. Whenever the controller is loaded
these helper files will be automatically loaded into memory so that you can use their methods anywhere
inside the controller:</p>
<div class="highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="k">namespace</span> <span class="nx">App\Controllers</span><span class="p">;</span>

<span class="k">class</span> <span class="nc">MyController</span> <span class="k">extends</span> <span class="nx">BaseController</span>
<span class="p">{</span>
    <span class="k">protected</span> <span class="nv">$helpers</span> <span class="o">=</span> <span class="p">[</span><span class="s1">&#39;url&#39;</span><span class="p">,</span> <span class="s1">&#39;form&#39;</span><span class="p">];</span>
<span class="p">}</span>
</pre></div>
</div>
</div>
</div>
<div class="section" id="validating-data">
<h2><a class="toc-backref" href="#id11">Validating data</a><a class="headerlink" href="#validating-data" title="Permalink to this headline">¶</a></h2>
<p>To simplify data checking, the controller also provides the convenience method <code class="docutils literal notranslate"><span class="pre">validate()</span></code>.
The method accepts an array of rules in the first parameter,
and in the optional second parameter, an array of custom error messages to display
if the items are not valid. Internally, this uses the controller’s
<strong>$this-&gt;request</strong> instance to get the data to be validated.
The <a class="reference internal" href="../libraries/validation.html"><span class="doc">Validation Library docs</span></a> have details on
rule and message array formats, as well as available rules.:</p>
<div class="highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="k">public</span> <span class="k">function</span> <span class="nf">updateUser</span><span class="p">(</span><span class="nx">int</span> <span class="nv">$userID</span><span class="p">)</span>
<span class="p">{</span>
    <span class="k">if</span> <span class="p">(</span><span class="o">!</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">validate</span><span class="p">([</span>
        <span class="s1">&#39;email&#39;</span> <span class="o">=&gt;</span> <span class="s2">&quot;required|is_unique[users.email,id,</span><span class="si">{</span><span class="nv">$userID</span><span class="si">}</span><span class="s2">]&quot;</span><span class="p">,</span>
        <span class="s1">&#39;name&#39;</span>  <span class="o">=&gt;</span> <span class="s1">&#39;required|alpha_numeric_spaces&#39;</span>
    <span class="p">]))</span>
    <span class="p">{</span>
        <span class="k">return</span> <span class="nx">view</span><span class="p">(</span><span class="s1">&#39;users/update&#39;</span><span class="p">,</span> <span class="p">[</span>
            <span class="s1">&#39;errors&#39;</span> <span class="o">=&gt;</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">validator</span><span class="o">-&gt;</span><span class="na">getErrors</span><span class="p">()</span>
        <span class="p">]);</span>
    <span class="p">}</span>

    <span class="c1">// do something here if successful...</span>
<span class="p">}</span>
</pre></div>
</div>
<p>If you find it simpler to keep the rules in the configuration file, you can replace
the $rules array with the name of the group as defined in <code class="docutils literal notranslate"><span class="pre">Config\Validation.php</span></code>:</p>
<div class="highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="k">public</span> <span class="k">function</span> <span class="nf">updateUser</span><span class="p">(</span><span class="nx">int</span> <span class="nv">$userID</span><span class="p">)</span>
<span class="p">{</span>
    <span class="k">if</span> <span class="p">(</span><span class="o">!</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">validate</span><span class="p">(</span><span class="s1">&#39;userRules&#39;</span><span class="p">))</span>
    <span class="p">{</span>
        <span class="k">return</span> <span class="nx">view</span><span class="p">(</span><span class="s1">&#39;users/update&#39;</span><span class="p">,</span> <span class="p">[</span>
            <span class="s1">&#39;errors&#39;</span> <span class="o">=&gt;</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">validator</span><span class="o">-&gt;</span><span class="na">getErrors</span><span class="p">()</span>
        <span class="p">]);</span>
    <span class="p">}</span>

    <span class="c1">// do something here if successful...</span>
<span class="p">}</span>
</pre></div>
</div>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">Validation can also be handled automatically in the model, but sometimes it’s easier to do it in the controller. Where is up to you.</p>
</div>
</div>
<div class="section" id="that-s-it">
<h2><a class="toc-backref" href="#id12">That’s it!</a><a class="headerlink" href="#that-s-it" title="Permalink to this headline">¶</a></h2>
<p>That, in a nutshell, is all there is to know about controllers.</p>
</div>
</div>


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