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To encrypt/decrypt a PGP file in PHP, you can follow these steps:

1. Install the GnuPG extension for PHP using Composer:

composer require php-gnupg/php-gnupg

1. Load the GnuPG module:

$gpg = new gnupg();

1. Set the path to the GnuPG executable:

$gpg->seterrormode(gnupg::ERROR_EXCEPTION);
$gpg->setarmor(1);
$gpg->setbinmode(gnupg::BINMODE_ASCII);
$gpg->addencryptkey($recipient_fingerprint);
$gpg->setpassphrase($passphrase);
$encrypted_data = $gpg->encrypt($data);

1. Decrypt the file:

$gpg = new gnupg();
$gpg->seterrormode(gnupg::ERROR_EXCEPTION);
$gpg->setarmor(1);
$gpg->setbinmode(gnupg::BINMODE_ASCII);
$gpg->adddecryptkey($recipient_fingerprint, $recipient_passphrase);
$decrypted_data = $gpg->decrypt($encrypted_data);