PHP Extension
Mailgun Send Send HTML Email with Attachments and HTML Images

Sends an HTML email with images and attachments.
Chilkat PHP Extension Downloads

PHP Extension
<?php

include("chilkat.php");

$success = false;

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

$http = new CkHttp();

$http->put_Login('api');
$http->put_Password('sending_api_key');//  Replace with your actual sending API key.

$req = new CkHttpRequest();
$req->put_HttpVerb('POST');
$req->put_Path('/v3/YOUR_DOMAIN_NAME/messages');
$req->put_ContentType('multipart/form-data');

// Change YOUR_DOMAIN_NAME to something like "mg.your-domain.com".
$req->AddParam('from','Your Name <mailgun@YOUR_DOMAIN_NAME>');
$req->AddParam('to','Joe Example <joe@example.com>');
$req->AddParam('subject','Hello Joe Example');
$req->AddParam('html','<html><body><b>This is the HTML body</b><br><img src=\'cid:cidStarfish.jpg\'></body></html>');

// An a attachd file
$bd = new CkBinData();
$success = $bd->LoadFile('qa_data/hamlet.zip');
if ($success == false) {
    print 'Failed to load file attachment.' . "\n";
    exit;
}

$req->AddBdForUpload('attachment','hamlet.zip',$bd,'application/zip');

// add an image as CID
$success = $bd->LoadFile('qa_data/jpg/starfish.jpg');
if ($success == false) {
    print 'Failed to load HTML image.' . "\n";
    exit;
}

$req->AddBdForUpload('inline','cidStarfish.jpg',$bd,'image/jpeg');

$resp = new CkHttpResponse();
$success = $http->HttpSReq('api.mailgun.net',443,true,$req,$resp);
if ($success == false) {
    print $http->lastErrorText() . "\n";
    exit;
}

$sbResponseBody = new CkStringBuilder();
$resp->GetBodySb($sbResponseBody);
$jResp = new CkJsonObject();
$jResp->LoadSb($sbResponseBody);
$jResp->put_EmitCompact(false);

print 'Response Body:' . "\n";
print $jResp->emit() . "\n";

$respStatusCode = $resp->get_StatusCode();
print 'Response Status Code = ' . $respStatusCode . "\n";
if ($respStatusCode >= 400) {
    print 'Response Header:' . "\n";
    print $resp->header() . "\n";
    print 'Failed.' . "\n";
    exit;
}

// Sample JSON response:
// (Sample code for parsing the JSON response is shown below)

// {
//   "id": "<20210429234809.1.2D550E1C94D3D98F@sandbox0e542e4c577f4bbb98c8bf6b6bca727b.mailgun.org>",
//   "message": "Queued. Thank you."
// }

// Sample code for parsing the JSON response...
// Use the following online tool to generate parsing code from sample JSON:
// Generate Parsing Code from JSON

$id = $jResp->stringOf('id');
$message = $jResp->stringOf('message');

?>