PHP

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

use Chilkat2\Email;

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

$email = new Email();
$email->Subject = 'Attachment with a custom header';
$email->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.
echo $email->GetMime(), "\n";