gnupg_clearsignkeys

(PECL gnupg >= 0.5)

Removes all keys which were set for signing before

<?php
$res = gnupg_init();
gnupg_clearsignkeys($res);
?>

<?php
$gpg = new gnupg();
$gpg->clearsignkeys();
?>

Source: reference/gnupg/functions/gnupg-clearsignkeys.xml · from the official PHP manual (php/doc-en)