How to override a controller in Magento In several time ,we need to override a controlller.How to override a controller in Magento. There are two process available: 1.Basic Old process. 2.Upgrade Process from Magento CE 1.5.0. First have describe second process. It available from Magento CE 1.5.0.Where, i have Overriding controllers magento core controller .I have using before tag for use to override controller of a module-   Here ,step to override a controllers: a)First check which module ,i want to override. Ex1: Suppose have override magento Magento Core Module Mage_Contacts and want override IndexController.php Write below code <frontend> <routers> <contacts> <args> <modules> <customcontacts before="Mage_Contacts">Amit_Customcontacts</customcontacts> </modules> </args> </contacts> </routers> </frontend>…