Magento Override Core Controller

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Example: Override ProductController.php

First create the following paths and files:

app/code/etc/modules/StickyLizard_CoreOverrides.xml

app/code/local/StickyLizard/CoreOverrides/etc/config.xml

app/code/local/StickyLizard/CoreOverrides/controllers/Catalog/ProductController.php

In app/code/etc/modules/StickyLizard_CoreOverrides.xml:

<config>

    <modules>

        <stickylizard_coreoverrides>

            <active>true</active>

            <codepool>local</codepool>

        </stickylizard_coreoverrides>

    </modules>

</config>

In app/code/local/StickyLizard/CoreOverrides/etc/config.xml:

<config>

    <modules>

        <stickylizard_coreoverrides>

            <version>0.1.0</version>

        </stickylizard_coreoverrides>

    </modules>

    <frontend>

        <routers>

            <catalog>

                <args>

                    <modules>

                        <stickylizard_coreoverrides before="Mage_Catalog">StickyLizard_CoreOverrides_Catalog</stickylizard_coreoverrides>

                    </modules>

                </args>

            </catalog>

        </routers>

    </frontend>

</config>

In app/code/local/StickyLizard/CoreOverrides/controllers/Catalog/ProductController.php

<!--?php

require_once Mage::getModuleDir('controllers', 'Mage_Catalog').DS.'ProductController.php';

class StickyLizard_CoreOverrides_Catalog_ProductController extends Mage_Catalog_ProductController

{

    public function viewAction()

    {

        echo "here I am";

        parent::viewAction();

    }

}

?-->