How to Create a Simple \'Hello World\' Module in Magento?

Creating a Simple "Hello World" Module in Magento

Creating a Module

To begin, create an XML file called MyCompanyName_HelloWorld.xml in the etc/modules directory within the Magento app folder.

<config>
    <modules>
        <MyCompanyName_HelloWorld>
            <active>true</active>
            <codePool>local</codePool>
        </MyCompanyName_HelloWorld>
    </modules>
</config>

Setting Up Directory Structure

Establish the module's directory structure:

- app/code/local/
  - MyCompanyName/
  - HelloWorld/
  |- Block/
  |- controllers/
  |- Model/
  |- Helper/
  |- etc/
  |- sql/

Configuring the Module

In app/code/local/MyCompanyName/HelloWorld/etc/config.xml, add:

<?xml version="1.0"?>
<config>
    <modules>
        <MyCompanyName_HelloWorld>
            <version>0.1.0</version>
        </MyCompanyName_HelloWorld>
    </modules>
</config>

Setting Up the Router

Modify config.xml to define the router:

<config>
    <!-- ... -->
    <frontend>
        <routers>
            <helloworld>
                <use>standard</use>
                <args>
                    <module>MyCompanyName_HelloWorld</module>
                    <frontName>helloworld</frontName>
                </args>
            </helloworld>
        </routers>
    </frontend>
    <!-- ... -->
</config>

Creating the Controller

Create a IndexController.php in app/code/local/MyCompanyName/HelloWorld/controllers/:

class MyCompanyName_HelloWorld_IndexController extends Mage_Core_Controller_Front_Action{
    public function indexAction(){
        echo "Hello World";
    }
}

Clear the Cache

Refresh the cache from the Magento Admin: System -> Cache Management -> Refresh All Cache -> Save Cache Settings

Additional Considerations

• Understand the difference between module/frontName and MVC controllers.
• Use the provided model objects instead of raw SQL queries when possible.
• Overriding existing classes requires caution.
• Magento MVC differs from other popular Ruby on Rails, Django, etc. models.

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