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It makes the iso just like I want it to. However, it doesn't do it in the background. The php script just hangs until the command is finished. I've also tried:
quartis, thanks for the reply. However, there's nothing in that command to tell it to operate in the background. The '&' in my first command tells the shell to execute the command in the background. The '> /dev/null' in my second command redirects output from the command to /dev/null (basically it just gets rid of it). The '&' and the output redirection are the two ways I know to execute something in the background, from a real shell that is.
I also had tried using sys_exec() instead of just exec(). The manual claims it's identical to the `...`. It didn't work either. Anyway just to be sure I tried your `$cmd` suggestion, and it still executed in the foreground (but still created the iso fine).