//Statuses/update
$c = new WeiboClient( WB_AKEY , 
           WB_SKEY , 
           $_SESSION['last_key']['oauth_token'] , 
           $_SESSION['last_key']['oauth_token_secret'] );

$msg = $c->update("测试发表微博");
if ($msg === false || $msg === null){
  echo "Error occured";
  return false;
}
if (isset($msg['error_code']) && isset($msg['error'])){
  echo ('Error_code: '.$msg['error_code'].'; Error: '.$msg['error'] );
  return false;
} 
echo($msg['id']." : ".iconv('UTF-8', 'GB2312',
$msg['text'])." - ".$msg["created_at"]);