Mage::getSingletone() : This method always finds for an existing object if not then create that a new object.
Mage::getModel() :This method always creates a new object.
How to Use Mage::getSingleton()
$contrCol1 = Mage::getSingleton('directory/country_collection');
How to Use Mage::getModel()
$contrCol1 = Mage::getModel('directory/country_collection');
7 years ago
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