PHP sending email with attachement - php

Question

I'm trying to send an email with an attachment in PHP 8 and, whilst it sends the email with the attachment okay, the attachments all come out as corrupted for the recipient. I've tried jpg, png and pdf and they all come out corrupted.
Worked fine with PHP 7.4 and previous but doesn't seem to work with PHP 8.
What has changed?
Here is the code -
Note: the other mail variables $recipient_email,$subject,$message are set prior to this code.
$mime_boundary="==Multipart_Boundary_x".md5(mt_rand())."x";
$tmp_name1 = $_FILES['attachment']['tmp_name'];
$type1 = $_FILES['attachment']['type'];
$name1 = $_FILES['attachment']['name'];
$size1 = $_FILES['attachment']['size'];
if (file_exists($tmp_name1)){
if(is_uploaded_file($tmp_name1)){
$file1 = fopen($tmp_name1,'rb');
$data1 = fread($file1,filesize($tmp_name1));
fclose($file1);
$data1 = chunk_split(base64_encode($data1));
}
$headers = "From: $myname <$mymail>\r\n" .
"Reply-To: <$mymail>\r\n" .
"Return-Path: <$mymail>\r\n";
"X-Mailer: PHP\r\n" .
"Disposition-Notification-To: ".$mymail." <$bcc>\r\n";
$headers .= "MIME-Version: 1.0\r\n" .
"Content-Type: multipart/mixed;\r\n" .
" boundary=\"{$mime_boundary}\"";
$body = "This is a multi-part message in MIME format.\n\n" .
"--{$mime_boundary}\n" .
"Content-Type: text/plain; charset=\"utf-8\"\n" .
"Content-Transfer-Encoding: 7bit\n\n" .
$message . "\n\n";
$body .= "--{$mime_boundary}\n" .
"Content-Type: {$type1};\n" .
" name=\"{$name1}\"\n" .
$data1 . "\n\n" .
"Content-Transfer-Encoding: base64\n\n";
$body .= "--{$mime_boundary}--\n";
mail($recipient_email,$subject,$body,$headers,"-f ".$mymail);

Answer 1

DOH, silly me.I had two lines of code transposed.
Should be this at the end -
"Content-Transfer-Encoding: base64\n\n" .
$data1 . "\n\n";
Instead of -
$data1 . "\n\n" .
"Content-Transfer-Encoding: base64\n\n";