Thanks for your reply, I allready created a for me (for now) valid solution, If it needs to be more specific I will change that later.
Btw: I do honestly disagree with your solution as I can't know from with the cron or one of those the temp files is used or not.
By that my server does NOT restart ;) ,.. and I can not use the default /tmp dir as this would have some security issues.
And finally: if I need to write cron-jobs for every script that creates tmp files,.. for every site that is beeing hosted....
:( I'll endup beeing a cron-programmer :(
However, thanks for your reply!