PHP Extension

Add a Custom Header to an Email Attachment

Demonstrates the Chilkat Email.AddAttachmentHeader method, which adds a custom MIME header field to an existing attachment identified by its zero-based index. This example adds an attachment (which becomes index 0), then attaches an extra header field to it and prints the resulting MIME.

Background: In MIME, every attachment is itself a mini-message with its own small block of headers — things like Content-Type, Content-Disposition, and Content-Transfer-Encoding that describe that specific part. AddAttachmentHeader lets you insert additional fields into that per-part header block, which is occasionally needed for interoperability with systems that look for custom X- headers or content identifiers on individual attachments.

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<?php

include("chilkat.php");

//  Demonstrates the AddAttachmentHeader method, which adds a custom MIME header field to
//  an existing attachment, identified by its zero-based index.

$email = new CkEmail();
$email->put_Subject('Attachment with a custom header');
$email->put_Body('The attachment has an extra MIME header.');

//  Add an attachment; it becomes attachment index 0.
$email->AddStringAttachment('data.txt','Attachment body.');

//  Add a custom header field to the first attachment (index 0).
$email->AddAttachmentHeader(0,'X-Custom-Attachment-Header','some value');

//  The custom header now appears in the attachment's MIME part.
print $email->getMime() . "\n";

?>