PHP

Get a Header Attribute of an Attached Message

Demonstrates the Chilkat Email.GetAttachedMessageAttr method, which returns a header-field attribute value for the Nth attached (embedded) email. The first argument is the zero-based attached-message index, the second is the header field name, and the third is the attribute name. This example attaches an email and reads the filename attribute of its Content-Disposition header.

Background: MIME header fields can carry named attributes (parameters) after the main value — for example Content-Disposition: attachment; filename="report.eml", where filename is an attribute. Rather than parsing the raw header yourself, this method extracts a single named attribute from a chosen header of a specific embedded message, which is convenient when a message forwards other emails as nested message/rfc822 parts.

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<?php

use Chilkat2\Email;

// Demonstrates the GetAttachedMessageAttr method, which returns a header-field attribute
// value for the Nth attached (embedded) email.  The first argument is the zero-based
// attached-message index, the second is the header field name, and the third is the attribute name.

// Build an inner email to attach.
$innerEmail = new Email();
$innerEmail->Subject = 'Embedded message';
$innerEmail->From = 'alice@example.com';
$innerEmail->AddTo('Bob', 'bob@example.com');

// Attach it to an outer email as a message/rfc822 part.
$email = new Email();
$email->Subject = 'Has an attached message';
try {
    $email->AttachEmail($innerEmail);
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

// Get the "filename" attribute of the "Content-Disposition" header of the first
// attached message (index 0).
$fname = $email->GetAttachedMessageAttr(0, 'Content-Disposition', 'filename');
echo 'Attached message filename attribute: ', $fname, "\n";