提交给Web服务器希伯来语字符串希伯来语都没有收到

我提交注册表格，从我的应用程序到Web服务器：

I submit a sign up form from my app to the web server:

EditText email = (EditText)findViewById(R.id.email);
EditText password = (EditText)findViewById(R.id.password);
EditText nickname = (EditText)findViewById(R.id.nickname);

List<NameValuePair> params = new ArrayList<NameValuePair>(2);
params.add(new BasicNameValuePair("email", email.getText().toString()));
params.add(new BasicNameValuePair("password", password.getText().toString()));
params.add(new BasicNameValuePair("nickname", nickname.getText().toString()));

HttpClient httpClient = new DefaultHttpClient();
HttpPost request = new HttpPost(url);
request.setEntity(new UrlEncodedFormEntity(params));
HttpResponse response = httpClient.execute(request);

当我输入希伯来文的绰号，它是在服务器（PHP /阿帕奇）作为相同长度的昵称字符串接受，但它们是无形字，即像空格。绝对不是希伯来语。任何线索的人？

When I type the nickname in Hebrew, it is received in the server (php/apache) as a string in the same length as the nickname, but with characters which are "invisible", i.e. look like blank spaces. definitely not Hebrew. Any clue someone?