(PECL gnupg >= 0.5)
gnupg_cleardecryptkeys — Removes all keys which were set for decryption before
gnupg_cleardecryptkeys(resource $identifier): bool
identifierThe gnupg identifier, from a call to gnupg_init() or gnupg.
Example #1 Procedural gnupg_cleardecryptkeys() example
<?php $res = gnupg_init(); gnupg_cleardecryptkeys($res); ?>
Example #2 OO gnupg_cleardecryptkeys() example
<?php $gpg = new gnupg(); $gpg->cleardecryptkeys(); ?>
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https://www.php.net/manual/en/function.gnupg-cleardecryptkeys.php