How to get Controller, Module, Action & Router Name in Magento

In most of the case you need to know the name of controller or module in order to debug. Simple one line code to get these.

1. Get Controller Name In Template Files:

$this->getRequest()->getControllerName();

2. Get Action Name In Template Files:

$this->getRequest()->getActionName(); //the function inside the controller

3. Get Router Name In Template Files:

$this->getRequest()->getRouteName();

4. Get Module Name In Template Files:

$this->getRequest()->getModuleName();

Finding Controller, Module, Action & Router Name In Class Files:

5. Get Controller Name In Class Files:

Mage::app()->getRequest()->getControllerName();

6. Get Action Name In Class Files:

Mage::app()->getRequest()->getActionName();

7. Get Router Name In Class Files:

Mage::app()->getRequest()->getRouteName();

8. Get Module Name In Class Files:

Mage::app()->getRequest()->getModuleName();

These functions i.e. getControllerName, getActionName, getRouteName, getModuleName are present in the class Mage_Core_Model_Url, you can display all the results by taking a vardump as
var_dump(Mage::app()->getRequest());

Hope this make sense to you and help you in debugging. Happy coding..:)