exec() PHP3/PHP4 incompatibility?

I have a weird problem. A program that I run with exec() with 3.0.14 does not work when run under 4.0.3. Basically, I use PGP to encrypt some data and store it in a database. Later, I have the user enter the passphrase and decrypt the file. Here is the decryption code. I store the encrypted data in a file called $tempasc. This file ends in ".asc". The first line below sets the home directory to the web directory, which is where the .pgp directory lives. The second puts the passphrase in the environment. The third executes the command. putenv("HOME=/var/www"); putenv("PGPPASS=$key"); exec($command = "/usr/local/bin/pgp +batchmode $tempasc 2>&1",$lines,$retval); Under 3.0.14, this creates the file $tempasc without the ".asc" on it with the data in it.l Under 4.0.3, it creates the same file, but it is zero length. I have put in debugging command to print the command string $command, as well as to print out the environment. In both cases, the HOME and PGPPASS variables are set correctly. So, the exec() seems to occur and run the correct command with the correct environment. It definitely runs under both 3.0.14 and 4.0.3, because the error_log in both cases contains the stdout/stderr of the pgp process and in both cases the file without the ".asc" on the end is created. However, under 3.0.14 the correct data is written, and under 4.0.3, the file is zero length. Any ideas? -- "There is no parameter that makes it impossible Jack McKinney for you to perform still more excellently." jackmc@lorentz.com -Mario Cuomo, on the lack of a clock in baseball http://www.lorentz.com 1024D/D68F2C07 4096g/38AEF076