php发邮件给多个人

$to = 'stanguan@megainformationtech.com,dylandai@megainformationtech.com';
$subject = 'count of upd files less than time span';
$message = AFFILIATE_NAME."_".AFFID.'=> lost upd files: '.implode(',',$lostUpdWithDatArr);
$headers = "MIME-Version: 1.0" . "\r\n";
$headers .= "Content-type:text/html;charset=UTF-8" . "\r\n";
$headers .= 'From: <stats@megainformationtech.com>'. "\r\n";
$result = mail($to, $subject, $message, $headers);