此代码已通过多次测试，可放心使用。

调用例子：
<?php

$attachment = fread ( fopen ( “upload/200901/4az0xokifcu6k.jpg”, “r” ), filesize ( “$tmpdir/$filename” ) );
$mail = new mime_mail ( );
$mail->from = “my@email.com”;
$mail->headers = “Errors-To: [EMAIL=my@email.com]my@email.com[/EMAIL]“;
$mail->to = “my@email.com”;
$mail->subject = “PHP atachment”;
$mail->body = “Get your file!”;
$mail->add_attachment ( “$attachment”, “$filename”, “Content-Transfer-Encoding: base64 /9j/4AAQSkZJRgABAgEASABIAAD/7QT+UGhvdG9zaG” );
$mail->send ();