Description:
------------
Unfortunately as far as I can tell, I am the only person having this problem- which leads me to wonder if it's an issue with my PHP configuration. Although I keep using default configuration, so I am at a loss. I have tried installing PHP and Apache, I have tried in xampp, and I have tried in WAMP. Every time after running the proc_open() command the PHP script will wait for the process to close before reading the next line- making reading or writing to any pipes impossible.

$fileDesc = array(
    0 => array("pipe", "r"), // STDIN
    1 => array("pipe", "w"), // STDOUT
    2 => array("pipe", "w") // STDERR
);
die("Got this far");
$handle = proc_open("C:/wherever/program.exe", $fileDesc, $pipes);
fwrite($pipes[0], "input");
fclose($pipes[0]);
proc_close($handle);

Displays "Got this far" and dies, as expected. However:

$fileDesc = array(
    0 => array("pipe", "r"), // STDIN
    1 => array("pipe", "w"), // STDOUT
    2 => array("pipe", "w") // STDERR
);
$handle = proc_open("C:/wherever/program.exe", $fileDesc, $pipes);
die("Got this far");
fwrite($pipes[0], "input");
fclose($pipes[0]);
proc_close($handle);

Will simply hang and seem to cease all function. The moment that I close program.exe through task manager the script continues as if nothing were wrong, dying with the output "Got this far". The input is never passed to the program, although no errors are raised when I hit the proc_close() line.

Reproduce code:
---------------
        $descriptors = array(
            0 => array("pipe", "r"), // STDIN. Used to feed input
            1 => array("pipe", "w"), // STDOUT. Used to read output
            2 => array("pipe", "w"), // STDERR. Used to read errors
            3 => array("pipe", "r") // We can feed the passphrase here
        );
        // Build the command line and start the process
        $cmd = '"C:/program files/gnu/gnupg/gpg.exe" --batch --no-verbose --passphrase-fd 3 --output decrypted.zip --decrypt encrypted.zip.gpg';
        $gpg = proc_open( $cmd, $descriptors, $pipes);
        if(is_resource($gpg)) {
            // Push passphrase to custom pipe
            fwrite($pipes[3], $passphrase);
            fclose($pipes[3]);
            proc_close($gpg);
        }

Expected result:
----------------
Expected to find decrypted.zip in the same directory as the PHP script (a decrypted version of encrypted.zip.gpg, which is located in the same directory as the PHP script)

Actual result:
--------------
When localhost/test.php was run the webpage continued to load indefinitely. I waited as long as 20 minutes. The PHP.ini file should stop execution after 30 seconds. When gpg.exe was killed with task manager the page loaded but the .zip file was never created.