php html mail with attachment empty - php

Question

I have this problem with PHP mail function:
I'm trying to sent an html email with a PDF file in attachment, the file is stored in a folder of mywebsite and created from me with mpdf, but when I send it the mail received has an attachment with size 0b.
this is the code:
<?
$attachment = "path_to_file_pdf.file.pdf";
if( file_exists($attachment)){
// File Exists
$size = filesize($attachment);
if( $size > 0 ){
//Alternative 1
$file = fopen($attachment,'rb');
$content = fread($file, $size);
fclose($file);
$content = chunk_split(base64_encode($content));
//Alternative 1
//$content = chunk_split(base64_encode(file_get_contents($attachment)));
$mailto = "example#maito.com";
$from_name = "MyDomainName";
$from_mail = "example#mydomain.com";
$replyto = "example#mydomain.com";
$uid = md5(uniqid(time()));
$subject = "e-mail subject here";
$message = "HTML MESSAGE HERE" ;
$filename = "file.pdf";
$header = "From: ".$from_name." <".$from_mail.">\r\n";
$header .= "Reply-To: ".$replyto."\r\n";
$header .= "Content-Type: multipart/mixed; boundary=\"PHP-alt-".$uid."\"\r\n\r\n";
$header .= "This is a multi-part message in MIME format.\r\n";
$header .= "--PHP-alt-".$uid."\r\n";
$header .= "Content-Type: text/html; charset=UTF-8\r\n";
$header .= "Content-Transfer-Encoding: 7bit\r\n\r\n";
$header .= $message."\r\n\r\n";
$header .= "--PHP-alt-".$uid."\r\n";
$header .= "Content-Type: application/pdf; name=\"".$filename."\"\r\n";
$header .= "Content-Transfer-Encoding: base64\r\n";
$header .= "Content-Disposition: attachment; \r\n\r\n";
$header .= $content."\r\n\r\n";
$header .= "--PHP-alt-".$uid."--";
if( #mail($mailto, $subject, "", $header) ){
echo "Mail SENT";
}else{
echo "ERROR - Mail error";
}
}else{
echo "ERROR- File size = 0";
}
}else{
echo "ERROR - File doesn't exist";
}
?>
The mail is sent correctly, so the file exist and its size is greater than 0b.
But when I receive the email in my emailbox it's all correct instead of the attachment that is present but empty.
I tryed both the 2 alternative of extracting the file content inserted in the code, but the result is the same.
Someone could help me?

Answer 1

I changed some headers configs. Try this:
<?
$attachment = "path_to_file_pdf.file.pdf";
if( file_exists($attachment)){
// File Exists
$size = filesize($attachment);
if( $size > 0 ){
//Alternative 1
$file = fopen($attachment,'rb');
$content = fread($file, $size);
fclose($file);
$content = chunk_split(base64_encode($content));
//Alternative 1
//$content = chunk_split(base64_encode(file_get_contents($attachment)));
$mailto = "example#maito.com";
$from_name = "MyDomainName";
$from_mail = "example#mydomain.com";
$replyto = "example#mydomain.com";
$uid = md5(uniqid(time()));
$subject = "e-mail subject here";
$message = "HTML MESSAGE HERE" ;
$filename = "file.pdf";
$header = "From: ".$from_name." <".$from_mail.">\r\n";
$header .= "Reply-To: ".$replyto."\r\n";
$header .= "Content-Type: multipart/mixed; boundary=\"PHP-alt-".$uid."\"\r\n\r\n";
$header .= "This is a multi-part message in MIME format.\r\n";
$header .= "--PHP-alt-".$uid."\r\n";
$header .= "Content-Type: text/html; charset=UTF-8\r\n";
$header .= "Content-Transfer-Encoding: 7bit\r\n\r\n";
$header .= $message."\r\n\r\n";
$header .= "--PHP-alt-".$uid."\r\n";
$header .= "Content-Type: application/octet-stream; name=\"".$filename."\"\r\n";
$header .= "Content-Transfer-Encoding: base64\r\n";
$header .= "Content-Disposition: attachment; filename=\"".$filename."\"\r\n\r\n";
$header .= $content."\r\n\r\n";
$header .= "--PHP-alt-".$uid."--";
if( #mail($mailto, $subject, "", $header) ){
echo "Mail SENT";
}else{
echo "ERROR - Mail error";
}
}else{
echo "ERROR- File size = 0";
}
}else{
echo "ERROR - File doesn't exist";
}
?>

Answer 2

Seen that I didn't receive answers, I only found one way to do that without problems, this way is to use PHPMailar class.
Thanx to the discussion:
Send attachments with PHP Mail()?