> The system() call will flush the headers to the client while exec() won't,
Yes.
> but exec() won't wait until the system call is over.
Huh? Exec waits unless the call itself forks using & to do something in the
background.
> Is there a way to make a system call, and wait until it ends, but don't
send the headers to > the client?
Maybe you can get what you want, whatever it is, with this:
http://php.net/manual/en/function.ob-start.php
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