Examples
Getting Key Information
<?php
putenv('GNUPGHOME=/home/sender/.gnupg');
// create new GnuPG object
$gpg = new gnupg();
// throw exception if error occurs
$gpg->seterrormode(gnupg::ERROR_EXCEPTION); 
// get list of keys containing string 'example'
try {
 $keys = $gpg->keyinfo('example');
 print_r($info);
} catch (Exception $e) {
 echo 'ERROR: ' . $e->getMessage();
}
?>

Encrypt a Simple Mail
<?php
// set path to keyring directory
// set path to keyring directory
putenv('GNUPGHOME=/home/sender/.gnupg');
// create new GnuPG object
$gpg = new gnupg();
// throw exception if error occurs
$gpg->seterrormode(gnupg::ERROR_EXCEPTION); 
// recipient's email address
$recipient = 'dgar@example.org';
// plaintext message
$plaintext = 
"Dear Dave,\n
 The answer is 42.\n
John";
// find key matching email address
// encrypt plaintext message
// display and also write to file
try {
 $gpg->addencryptkey($recipient);
 $ciphertext = $gpg->encrypt($plaintext);
 echo '<pre>' . $ciphertext . '</pre>';
 file_put_contents('/tmp/ciphertext.gpg', $ciphertext);
} catch (Exception $e) {
 die('ERROR: ' . $e->getMessage());
}
?>

Decryption The Mail
<?php
// set path to keyring directory
putenv('GNUPGHOME=/home/recipient/.gnupg');
// create new GnuPG object
$gpg = new gnupg();
// throw exception if error occurs
$gpg->seterrormode(gnupg::ERROR_EXCEPTION); 
// recipient's email address
$recipient = 'dgar@example.org';
// ciphertext message
$ciphertext = file_get_contents('/tmp/ciphertext.gpg');
// register secret key by providing passphrase
// decrypt ciphertext with secret key
// display plaintext message
try {
 $gpg->adddecryptkey($recipient, 'guessme');
 $plaintext = $gpg->decrypt($ciphertext);
 echo '<pre>' . $plaintext . '</pre>';
} catch (Exception $e) {
 die('ERROR: ' . $e->getMessage());
}
?>