Rewrite an HTTP request for Vuforia - php

Question

Can anybody help me to rewrite the following request in curl or anything similar which is available in php 5.6? I'm new with http request in PHP and I'm not able to use the HttpRequest class cause it can't be found on the server. Other suggestions are welcome too. Maybe there is already a library?
$path = "content/images/calendarmotiv/";
$fail = true;
$tmp = $_FILES['imagetarget']['tmp_name'];
$name = basename($_FILES['imagetarget']['name']);
if(move_uploaded_file($tmp, $path.$name))
{
// http request body
$now = new DateTime('NOW');
$body = json_encode(array(
"name" => $name,
"width" => 1024.0,
"image_url" => base64_encode($path.$name),
"active_flag" => 1,
"application_metadata_url" => base64_encode($_POST["metadata"]))
);
$http_verb = "POST";
$content_md5 = md5($body);
$content_type = "application/json";
$date = str_replace("+0000", "GMT", $now->format(DateTime::RFC1123));
$request_path = "<a href='https://vws.vuforia.com/targets'> https://vws.vuforia.com/targets</a>";
// auth string for header
$string_to_sign = $http_verb . "\n" . $content_md5 . "\n" . $content_type . "\n" . $date . "\n" . $request_path;
$secret_key = "mykey";
$signature = hash_hmac("sha1", $string_to_sign, $secret_key);
$authstring = "VWS " . $secret_key . ":" . $signature;
// the request
$request = new HttpRequest($request_path, HttpRequest::METH_POST);
$request->setContentType($content_type);
$request->setBody($body);
$request->addHeaders(array(
"Date" => $date,
"Authorization" => $authstring));
$request->send();
echo $request->getRequestMessage();
echo $request->getResponseMessage();
}

Answer 1

I've created a Vuforia client class in PHP for basic operations with Vuforia target database:
https://github.com/FionNoir/VuforiaClient