如何用密码调用linux调用linux GPG加密文件

I have a task which need to

use gpg to encrypt the upload file in php

my code is:

("echo '1234' | gpg --passphrase-fd 0 -c /path/aaa.jpg ");

it works by paste the code in linux

but not work by php any solution

You need to use gnupg_decypt() to decrypt the text.