Database insert script

I need a script which can insert product details inside a website. I will import product details inside a website, add pictures, PDF attachments and description, and then I need the script to copy all of that information and send it into a Prestashop website and make those products active with all that information. The complete list of information is compiled from product code, product name, price, stock, discount table ID, category code, description, photo(s) and attachment which can be an archive or a PDF file. The script should compare both databases and check if they have the same entries of products. If the script sees that the Prestashop website has less entries, then it creates the missing ones with all the information described here.