Recently I found, that Google Docs have their own PHP API. Honestly I haven't read it all, but I wonder is it possible If for example I have XML file or just text string in variable and I would like to convert it and create PDF file from it ( for example ), then would it be possible? Or even if it is possible it would take a lot of time to process?
Yes, this is possible. Slightly time consuming as you will have to format the PDF.. I suggest using a class like FPDF or EZPDF, to create the PDF output from PHP.