(PECL gnupg >= 0.1)
gnupg_keyinfo — Returns an array with information about all keys that matches the given pattern
gnupg_keyinfo ( resource $identifier , string $pattern ) : array
identifier
The gnupg identifier, from a call to gnupg_init() or gnupg.
pattern
The pattern being checked against the keys.
 Returns an array with information about all keys that matches the given pattern or false, if an error has occurred. 
Example #1 Procedural gnupg_keyinfo() example
<?php $res = gnupg_init(); $info = gnupg_keyinfo($res, 'test'); print_r($info); ?>
Example #2 OO gnupg_keyinfo() example
<?php
$gpg = new gnupg();
$info = $gpg -> keyinfo("test");
print_r($info);
?> 
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    https://www.php.net/manual/en/function.gnupg-keyinfo.php