More about fpdf

Hi everyone. Here i am again talking about fpdf. In the last question Peter told me that i can set a folder to write a pdf file by fpdf class but, to do that i ought to set permission to web user to write in this folder and think it´s bad to security. I thought a lot about it and then came back here to try to explain a little doubt. Could i write the pdf file into a temporary folder of php and then put it into the right folder by ftp? If yes, anyone could help me about that, something like; which folder can i write the file? Thanks a lot.