使用Net_SSH2 :: exec（）的phplibsec环境变量

Are there any built-in methods to set environmental variables with phplibsec's Net_SSH2 class?

For instance

include('Net/SSH2.php');

$ssh = new Net_SSH2('www.domain.tld');
if (!$ssh->login('username', 'password')) {
    exit('Login Failed');
}
// $ssh->setEnv('TEST=Hello');
echo $ssh->exec('echo $TEST');
?>