php mail 发附件为什么是0字节

Question

大家帮忙指教一下!为什么我的mail发送附件收到的是0字节.
代码如下:
<?php //Send Event Order
$toaddress = '[email protected]';
$subject = 'Event order'; 
$mailcontent = '1/01.pdf';
$fileName= '01.pdf';
$body="Event order!";
$boundary = uniqid( ""); 
$headers = "From: [email protected] 
Content-type: multipart/mixed;boundary=\"$boundary\""; 
# open 
$fp = fopen($mailcontent, "r"); 
# read 
$read = fread($fp, filesize($mailcontent)); 
$read = base64_encode($read); 
$read = chunk_split($read); 
$body = "--$boundary 
Content-type: text/plain; charset=iso-8859-1 
Content-transfer-encoding: 8bit $body--$boundary 
Content-type: application/pdf; name=$fileName 
Content-disposition: attachment; filename=$fileName 
Content-transfer-encoding: base64 $read --$boundary--"; 
  
mail($toaddress, $subject, $body, $headers);
?>

Answer 1

改成这样附件部分出现乱码:
<?php //Send Event Order
$toaddress = "[email protected]";
$subject = "Event order"; 
$mailcontent = "1/01.pdf";
$fileName= "01.pdf";
$body="Event order!";
$boundary = uniqid( ""); 
$headers = "Content-type: multipart/mixed;boundary= $boundary\r\n"; 
$headers .= "From: [email protected]\r\n";
# open 
$fp = fopen($mailcontent, "r"); 
# read 
$read = fread($fp, filesize($mailcontent)); 
$read = base64_encode($read); 
$read = chunk_split($read); 
$body = "--$boundary
Content-type: text/plain; charset=iso-8859-1 
Content-transfer-encoding: 8bit $body--$boundary 
Content-type: application/pdf; name=$fileName
Content-disposition: attachment; filename=$fileName 
Content-transfer-encoding: base64 $read --$boundary--"; 
  
mail($toaddress, $subject, $body, $headers);
?>