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    <ol> <li><p>Create your module folders and files</p> <pre><code>app/code/local/MyNameSpace/MyModule/etc/config.xml app/code/local/MyNameSpace/MyModule/controllers/Checkout/CartController.php app/etc/modules/MyNameSpace_All.xml </code></pre></li> <li><p>Edit /etc/config.xml and Create app/code/local/MyNameSpace/MyModule/etc/config.xml with the following content:</p> <pre><code>&lt;?xml version="1.0"?&gt; &lt;config&gt; &lt;modules&gt; &lt;MyNameSpace_MyModule&gt; &lt;version&gt;0.1.0&lt;/version&gt; &lt;/MyNameSpace_MyModule&gt; &lt;/modules&gt; &lt;global&gt; &lt;!-- This rewrite rule could be added to the database instead --&gt; &lt;rewrite&gt; &lt;!-- This is an identifier for your rewrite that should be unique --&gt; &lt;!-- THIS IS THE CLASSNAME IN YOUR OWN CONTROLLER --&gt; &lt;mynamespace_mymodule_checkout_cart&gt; &lt;from&gt;&lt;![CDATA[#^/checkout/cart/#]]&gt;&lt;/from&gt; &lt;!-- - mymodule matches the router frontname below - checkout_cart matches the path to your controller Considering the router below, "/mymodule/checkout_cart/" will be "translated" to "/MyNameSpace/MyModule/controllers/Checkout/CartController.php" (?) --&gt; &lt;to&gt;/mymodule/checkout_cart/&lt;/to&gt; &lt;/mynamespace_mymodule_checkout_cart&gt; &lt;/rewrite&gt; &lt;/global&gt; &lt;!-- If you want to overload an admin controller this tag should be &lt;admin&gt; instead, or &lt;adminhtml&gt; if youre overloading such stuff (?) --&gt; &lt;frontend&gt; &lt;routers&gt; &lt;mynamespace_mymodule&gt; &lt;!-- should be set to "admin" when overloading admin stuff (?) --&gt; &lt;use&gt;standard&lt;/use&gt; &lt;args&gt; &lt;module&gt;MyNameSpace_MyModule&lt;/module&gt; &lt;!-- This is used when "catching" the rewrite above --&gt; &lt;frontName&gt;mymodule&lt;/frontName&gt; &lt;/args&gt; &lt;/mynamespace_mymodule&gt; &lt;/routers&gt; &lt;/frontend&gt; </code></pre> <p></p> <p>Note: The above didn’t work for me when I override catalog/product controller. I had to use:</p> <pre><code> &lt;from&gt;&lt;![CDATA[#^catalog/product/#]]&gt;&lt;/from&gt; &lt;to&gt;mymodule/mycontroller&lt;/to&gt; </code></pre> <p>(notice the missing leading slash)</p> <p>Since Magento 1.3 you can simply add your module to the frontend router. Rewrites are not neccessary any more:</p> <pre><code> &lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;config&gt; &lt;modules&gt; &lt;MyNameSpace_MyModule&gt; &lt;version&gt;0.1.0&lt;/version&gt; &lt;/MyNameSpace_MyModule&gt; &lt;/modules&gt; &lt;frontend&gt; &lt;routers&gt; &lt;checkout&gt; &lt;args&gt; &lt;modules&gt; &lt;MyNameSpace_MyModule before="Mage_Checkout"&gt;MyNameSpace_MyModule&lt;/MyNameSpace_MyModule&gt; &lt;/modules&gt; &lt;/args&gt; &lt;/checkout&gt; &lt;/routers&gt; &lt;/frontend&gt; </code></pre> <p> Please note that <code>before=”Mage_Checkout”</code> will load your controller first if available and fall back to Magento’s if not.</p> <p>If the controller is in another folder, you’ll have to modify the code:<br> <code>app/code/local/MyNameSpace/MyModule/controllers/Checkout/CartController.php.</code> </p></li> </ol> <p><strong>Replace</strong></p> <p><code>&lt;MyNameSpace_MyModule before="Mage_Checkout"&gt;MyNameSpace_MyModule&lt;/MyNameSpace_MyModule&gt;</code></p> <p><strong>with</strong></p> <pre><code> &lt;MyNameSpace_MyModule before="Mage_Checkout"&gt;MyNameSpace_MyModule_Checkout&lt;/MyNameSpace_MyModule&gt; </code></pre> <ol> <li><p>Edit <code>'controllers/Checkout/CartController.php'</code></p> <p>Create <code>app/code/local/MyNameSpace/MyModule/controllers/Checkout/CartController.php</code> with the following content: (the only change to indexAction() is adding an error_log() call):</p> <pre><code> &lt;?php # Controllers are not autoloaded so we will have to do it manually: require_once 'Mage/Checkout/controllers/CartController.php'; class MyNameSpace_MyModule_Checkout_CartController extends Mage_Checkout_CartController { # Overloaded indexAction public function indexAction() { # Just to make sure error_log('Yes, I did it!'); parent::indexAction(); } } </code></pre> <ol> <li><p>Edit <code>'app/etc/modules/MyNameSpace_All.xml'</code> (This is to activate your module)</p> <p> true local </p></li> </ol></li> <li><p>Edit <code>'app/design/frontend/[myinterface]/[mytheme]/layout/checkout.xml'</code> and add the following to use the same update handle as before:</p> <pre><code> &lt;mynamespace_mymodule_checkout_cart_index&gt; &lt;update handle="checkout_cart_index"/&gt; &lt;/mynamespace_mymodule_checkout_cart_index&gt; </code></pre> <p>(Note that these tags seem to be case sensitive. Try using all lowercase if this isn’t working for you)</p> <p>[by Hendy: When I override catalog/product/view using the method described in this Wiki or here, I didn’t have to do the above. However, when using the 'cms way', I had to update the handle manually.]</p> <p>The above item did not work for me (2009-02-19 by Jonathan M Carvalho)</p> <p>I discovered that the file to change is app/design/frontend/[myinterface]/[mytheme]/layout/mymodule.xml</p> <p>Add the following lines:</p> <p> <br> </p> <ol> <li>Point your browser to /checkout/cart/ In your PHP error log, you should find ‘Yes, I did it!’.</li> </ol> <p>You need to be extra precise with the rewrite regular expression because errors are very hard to find.</p> <p></p></li> </ol>
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