<?php
function tweet($mensagem, $usuario, $senha) {
  $contexto = stream_context_create(array(
    'http' => array(
      'method'  => 'POST',
      'header'  => sprintf("Authorization: Basic %s\r\n", base64_encode($usuario.':'.$senha)).
                   "Content-type: application/x-www-form-urlencoded\r\n",
      'content' => http_build_query(array('status' => $mensagem)),
      'timeout' => 10
    ),
  ));
  $ret = file_get_contents('http://twitter.com/statuses/update.xml', false, $contexto);
 
  return (false !== $ret);
}                    
?>