export xl/csv file to Magento import file format ( PHP )

I have some .xl & .csv file. I need a php scrip where i can define new attributes & export it ( from php script) to Magneto import standard format. - I will give you UI. - Only Master setup script I Need: Download it in a standard .csv file format. Please revert if you have done something like this or done already. Needs to be done in one day.