chinese notify email char Garbled

[xcl3721]

fixed by myself already

$header = 'MIME-Version: 1.0' . "\r\n". //here
'Content-type: text/plain; charset=utf-8' . "\r\n". //here
"From: ". "=?UTF-8?B?".base64_encode($sender->getFullName() )."?= <". $sender->getEmail() .">\r\n" .//here
"Reply-To: ". $sender->getFullName() ." <". $sender->getEmail() .">\r\n";

$message .= getMLText("email_header")."\r\n\r\n".$message;
$message .= "\r\n\r\n".getMLText("email_footer");
$subject=$this->replaceMarker($subject);
$subject = "=?UTF-8?B?".base64_encode($subject)."?=";//here