(PECL gnupg >= 0.1)
gnupg_encrypt — Encrypts a given text
$identifier
   , string $plaintext
   )
   Encrypts the given plaintext with the keys, which
   were set with gnupg_addencryptkey before and
   returns the encrypted text.
  
identifierThe gnupg identifier, from a call to gnupg_init() or gnupg.
plaintextThe text being encrypted.
    On success, this function returns the encrypted text.
    On failure, this function returns FALSE.
  
Example #1 Procedural gnupg_encrypt() example
<?php
$res = gnupg_init();
gnupg_addencryptkey($res,"8660281B6051D071D94B5B230549F9DC851566DC");
$enc = gnupg_encrypt($res, "just a test");
echo $enc;
?>
Example #2 OO gnupg_encrypt() example
<?php
$gpg = new gnupg();
$gpg -> addencryptkey("8660281B6051D071D94B5B230549F9DC851566DC");
$enc = $gpg -> encrypt("just a test");
echo $enc;
?>