PHP email attachments

Question

I'm trying to send emails with multiple attachments.

This is an example:
$uid = md5(uniqid(time()));
$header = "From: Test <test@test.com>\r\n";
$header.= "MIME-Version: 1.0\r\n";
$header.= "Content-Type: multipart/mixed; boundary=\"". $uid. "\"\r\n\r\n";
$header.= "--". $uid. "\r\n";
$header.= "Content-type:text/plain; charset=iso-8859-1\r\n";
$header.= "Content-Transfer-Encoding: 7bit\r\n\r\n";
$header.= "Test Email\r\n\r\n";
$header.= "--". $uid. "\r\n";
$header.= "Content-Type: text/x-csv; name=\"1.csv\"\r\n";
$header.= "Content-Transfer-Encoding: base64\r\n";
$header.= "Content-Disposition: attachment; filename=\"1.csv\"\r\n\r\n";
$header.= $csvfile1. "\r\n\r\n";
$header.= "--". $uid. "--";
$header.= "Content-Transfer-Encoding: 7bit\r\n\r\n";
$header.= "Test Email\r\n\r\n";
$header.= "--". $uid. "\r\n";
$header.= "Content-Type: text/x-csv; name=\"2.csv\"\r\n";
$header.= "Content-Transfer-Encoding: base64\r\n";
$header.= "Content-Disposition: attachment; filename=\"2.csv\"\r\n\r\n";
$header.= $csvfile2. "\r\n\r\n";
$header.= "--". $uid. "--";
$header.= "Content-Transfer-Encoding: 7bit\r\n\r\n";
$header.= "Test Email\r\n\r\n";
$header.= "--". $uid. "\r\n";
$header.= "Content-Type: text/x-csv; name=\"3.csv\"\r\n";
$header.= "Content-Transfer-Encoding: base64\r\n";
$header.= "Content-Disposition: attachment; filename=\"3.csv\"\r\n\r\n";
$header.= $csvfile3. "\r\n\r\n";
$header.= "--". $uid. "--";

And I get some strange characters at the end of the csv files, something like this:
w־סֽד·ֽסמ׳fק־ןo,
‰z{©}ךֺxn+¢”j״¶'Eט²¶*Jײֻrֵz°¶+·$j״¶'5ל†·u+¶+‰ֻ{²װj״¶',

What could be the problem?

Thanks.

Answer 1

Some issues:

• There should be only one new line before a boundary. You have 2.
• You should have 2 dashes only after the last boundary.
• There are 2 places where Content-Transfer-Encoding needs to have a new line before.
• You may have forgotten to base64 encode your files.
• Your code looks like the result of some terrible copy-pasting.
• Maybe other.

As El Yobo said in a comment, maybe you should try using a library for this.