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Useful code in Magento

I am listing here the codes useful in Magento

Magento Home URL 
- Mage::getBaseUrl();

Magento Home Directory 
- Mage::getBaseDir();

URL of a file in the skin directory
- $this->getSkinUrl(‘images/myfile.png’); // in a template or Block
- Mage::getDesign()->getSkinUrl(‘images/myfile.png’); // from anywhere

Format a price value
- Mage::helper(‘core’)->formatPrice($amount);

Get the display value of a (multi-)select product attribute
- echo $product->getAttributeText(‘manufacturer’);

Create an object instance in magento
- Mage::getModel(‘module/class’);  // for models
- Mage::helper(‘module/class’); // for helpers
- Mage::app()->getLayout()->createBlock(‘module/class’, ‘name_in_layout’); // for blocks

GET/POST parameters
- Mage::app()->getRequest()->getParam(‘param_name’); // single parameter
- Mage::app()->getRequest()->getParams(); // all parameters

Get the Id of the curent store view
- Mage::app()->getStore()->getId();

Get all Store Views
- Mage::app()->getStores(); // pass true to include the admin store view, too

Get the configurable/grouped/bundled product a simple product belongs to
- $simpleProduct->loadParentProductIds();	
- $parentProductIds = $simpleProduct->getParentProductIds();

Get the simple products assigned to a configurable product
$configProduct->getTypeInstance()->getUsedProductCollection($configProduct);

Get an instance of an attribute
Mage::getSingleton(‘eav/config’)->getAttribute($entityType, $attributeCode);

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