确保你installed the gnupg extension for PHP。

$gpg = new gnupg();
$publicData = file_get_contents('public.asc');
$publicKey = $gpg->import($publicData);
$gpg->addencryptkey($publicKey['fingerprint']);
echo $gpg->encrypt('Data to encrypt');

取代加密常数，以档案内容取代，并将加密的消息储存在您想要的任何位置。

首先通过www-data创建新文件夹所有者

mkdir /var/www/.gnupg
sudo chown -R www-data:www-data  /var/www/.gnupg

第二次尝试以下php代码：

putenv("GNUPGHOME=/var/www/.gnupg");
    $gpg = new gnupg();
    $publicData = file_get_contents('/var/www/html/web/resources/keys/public.asc');
    $privateData = file_get_contents('/var/www/html/web/resources/keys/SECRET.asc');
    $publicKey = $gpg->import($publicData);
    $gpg->addencryptkey($publicKey['fingerprint']);
    $encrypt = ($gpg->encrypt('Data to encrypt'));
    echo $encrypt;