(PHP Extension) Add Header Field to MIME Sub-Header in Email

Demonstrates how to add a header field to one of the attachment sub-headers in an email.

Chilkat PHP Downloads PHP Extension for Windows, Linux, MacOS, Alpine Linux, Solaris

<?php

// The version number (9_5_0) should match version of the Chilkat extension used, omitting the micro-version number.
// For example, if using Chilkat v9.5.0.48, then include as shown here:
include("chilkat_9_5_0.php");

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

$email = new CkEmail();

$email->put_Subject('test');
$email->AddTo('Chilkat','support@chilkatsoft.com');
$email->put_From('Matt <matt@example.com>');
$email->put_Body('This is a simple plain-text body.');

$success = $email->AddFileAttachment2('qa_data/1.HPM','application/x-hprimnet');
if ($success != true) {
    print $email->lastErrorText() . "\n";
    exit;
}

// Add a "ContentDescription: HPM/3.0" in the attachment's sub-header.
// The 1st attachment is at index 0.
$email->AddAttachmentHeader(0,'Content-Description','HPM/3.0');

// Show the email MIME:
print $email->getMime() . "\n";

// This is the output:
// (Note: When Chilkat sends email, all CKX-* headers are removed prior to sending.)

// MIME-Version: 1.0
// Date: Wed, 16 Jan 2019 10:05:18 -0600
// Message-ID: <93B88835586270B7BE5202F84E171F29C10BA935@CHILKATSLICE>
// Content-Type: multipart/mixed; boundary="------------000502000000020502010608"
// X-Priority: 3 (Normal)
// Subject: test
// To: Chilkat <support@chilkatsoft.com>
// From: Matt <matt@example.com>
// CKX-Bounce-Address: matt@example.com
// 
// --------------000502000000020502010608
// Content-Type: text/plain; charset=us-ascii; format=flowed
// Content-Transfer-Encoding: 7bit
// 
// This is a simple plain-text body.
// --------------000502000000020502010608
// Content-Type: application/x-hprimnet; name="1.HPM"
// Content-Transfer-Encoding: base64
// Content-Disposition: attachment; filename="1.HPM"
// Content-Description: HPM/3.0
// 
// FILE_DATA_IS_HERE...
// 
// --------------000502000000020502010608--

?>