一次处理多个用户的文件（后勤问题）

Question

Hey my app creates files on server that are shown to users right away in html element called iframe. So far I have been storing all files into same folder, overwriting old ones each time user requested new one. Problem is that if more than one user tried to generate file at once, one of them might not get the right file, or no file at all. I guess i should create random temp folder for each generation of files. That would work, but my server might get filled up really quickly in like 100 generations of files. I need to delete this random temp folder once user is done loading up file in iframe, but how do I call php function on load?
Any other alternative method/idea, would help me alot. How do others handle such problems?

Answer 1

I would create one single temp folder, and generate random file names (md5, GUID, don't matter).
The same script that generate the file on the folder to visualization, before the generation itself, should check all the files on the folder, excluding all the files which were generated >= 1 day ago.

Check the filemtime function and this question if you have any doubts about how to get the file creation/modification date.