Need tty for background process. How?

[Anon]

I am executing a gpg command through system() function from a php script.

The error I am getting is "Sorry, no terminal at all requested - can't get input" because (I think) there is no tty associated with the bacground process triggered from the script.

What do I have to do to get it working?

[Anon]

Is gpg expecting to get a password or key from the user?
If so, you may be in a bit of trouble, since if the program
is explicitly opening a tty it's hard to get around that.
Does the documentation discuss batch mode at all?

[Anon]

Thanks for the batch hint, I found the solution. I set the batch mode in the option file and pass the passphrase to gpg, works fine now:

gpg --decrypt --passphrase-fd 0 -o decrypt crypt < password

[Anon]

Uhh, you want to be careful about writing the password
or the plaintext to disk; this may leave them lying around
for others to find.