function makeAttachment($attachment){
if($attachment["name"] != ""){
$headers = "Content-Type: " . $attachment["type"];
$headers .= "; \r\t name=\"{$attachment["name"]}\"";
$headers .= "\r\n";
$headers .= "Content-Transfer-Encoding: base64\r\n";
$headers .= "Content-Disposition: attachment; \r\n\t filename=\"{$attachment["name"]}\"";
$headers .= "\r\n\r\n";
$headers .= $this->encode_string($attachment["content"], $encoding = "base64");
$headers .= "\r\n\r\n";
}
return($headers);
}


\r\n\r\n 为什么不能生成空白行？