How to add Magento 1 meta description programmatically. I have to add all product meta description in my Magento 1 store.
Export products (System>Import/Export) and that gives you the csv structure. You can delete all columns but keep sku, store and meta description. Put the data you want into the csv. Save it as UTF-8 (don't use MS excel!) and import (System>Import/Export) replacing existing data. Make sure you try this on a dev site first and use the 'check data' function to make sure everything is correct before importing. Good luck.
Edited: I realise this isn't doing it programmatically but you really don't need to write any code for this. Magento import handles it OK.