magento overwrite core controller

source

<config>

<frontend> [1]

<routers>

<checkout> [2]

<args>

<modules>

<yourModule before="Mage_Checkout">Namespace_Module_Overwrite_Checkout</yourModule> [3]

</modules>

</args>

</checkout>

</routers>

</frontend>

</config>

[1] Depending on the controllers area ,”frontend” or “admin”
[2] Router node of the module to be overridden (look it up in the config.xml of that module)
[3] The tag can be anything, it must be unique within the node.
Your_Module_Overwrite_Checkout (is mapped to directory)
Your/Module/controllers/Overwrite/Checkout/

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