Magento: Add custom attribute to Magento’s PDF invoice

Hello everyone! Today I’ll show you how to add custom attribute to Magento’s generated PDF invoice in just a few steps. Since this article is pretty straight-forward, here we go.
One of my recent tasks was to create a custom attribute for products called inchoo_warehouse_location, and output it when click on “Print” (invoice in admin section) occurs. Since PDF generation is Magento’s core functionality, we’ll have to rewrite it a bit.
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