.bash_history

echo "sterreich"
echo "sterreich""

output

php test.php
Last login: Fri Feb 28 15:11:46 2014 from localhost
mbp-felix:~ foo$ echo "This is a test"
This is a test
mbp-felix:~ foo$ 

LANG=
LC_COLLATE="C"
LC_CTYPE="C"
LC_MESSAGES="C"
LC_MONETARY="C"
LC_NUMERIC="C"
LC_TIME="C"
LC_ALL=
Österreich äöüß


echo "Österreich"
Last login: Fri Feb 28 15:12:31 2014 from localhost
mbp-felix:~ foo$ echo "sterreich"
sterreich
mbp-felix:~ foo$ %                                            

test.php

<?php

require 'vendor/autoload.php';

$ssh = new Net_SSH2('127.0.0.1');
$ssh->setTimeout(10);

if (!$ssh->login('foo', 'foo'))
{
  throw new Exception('Could not login to SSH server.');
}

echo $ssh->read('mbp-felix:~ foo$ ');
$ssh->write('echo "This is a test"' . "\n");
echo $ssh->read('mbp-felix:~ foo$ ');
echo "\n\n";

echo $ssh->exec('locale');
echo $ssh->exec('echo "Österreich äöüß"');
echo "\n\n";

$ssh->write('echo "Österreich"' . "\n");
echo $ssh->read('mbp-felix:~ foo$ ');

$ssh->write('echo "äöüß"' . "\n");
echo $ssh->read('mbp-felix:~ foo$ ');

$ssh->disconnect();