https://www.php.net/manual/es/function.gnupg-clearsignkeys.php
PHP: gnupg_clearsignkeys - Manual
Elimina todas las claves que fueron fijadas para firma previamente
phpgnupgmanual
https://www.php.net/manual/zh/function.gnupg-clearsignkeys.php
PHP: gnupg_clearsignkeys - Manual
Removes all keys which were set for signing before
phpgnupgmanual