Magento product report resource collection allows you to get most popular products based on different options.
functions we will use: addOrderedQty, setOrder
Let's load this resource collection first like this:
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In Magento you can load your model with getModel. You can optionally pass parameters to the model class constructor. All you need to do is:
Mage::getModel('model_class', 'arguments_as_array_if_any');
For example: I want to load Data.php model from: https://github.com/dbashyal/Magento-General-Module-Extension