proc_open to return an encrypted string?

Hello, I want to take a String variable and GPG encrypt it, then email the encrypted string. One of our developers suggested using "proc_open" and to "set the process to 'gpg -a --encrypt -r 0x35E891B0'", but couldn't clarify. How is this done? Would it be something like this...? ----------------------------------------- $message = "Text or HTML string"; $pipes = "-a --encrypt -r 0x35E891B0"; $descriptorspec = array(0 => array("pipe", "r"), 1 => array("pipe", "w"), 2 => array("file", "/tmp/error-output.txt", "a")); $process = proc_open("gpg", $descriptorspec, $pipes); if (is_resource($process)) { fwrite($pipes[0], $message); fclose($pipes[0]); while(!feof($pipes[1])) { echo fgets($pipes[1], 1024); } fclose($pipes[1]); $return_value = proc_close($process); } send_mail($smtp_server, $smtp_port, $sender_email, $recipient_email, $subject, $message, $headers); ---------------------------------------- Thank you, Bob Van