Spreadshirt get Design Data from image URL

<?php

$user_agent = 'test/1.0 (http://tshirtfamily.fr/; test@mail.de)';
ini_set('user_agent', $user_agent);

// Default values
$designId = 0;
$url = '';

if (!empty($_REQUEST['url'])) {
    $url = strip_tags(htmlentities($_REQUEST['url']));
    preg_match('/designs\/(\w*)/i', $url, $matches);
    $designId = $matches[1];
}

$site_url = 'https://api.spreadshirt.net/api/v1/shops/205909/designs/'.$designId.'?locale=fr_FR&fullData=true';

$header = array();
$header[] = createSprdAuthHeader("GET", $site_url);
$header[] = "Content-Type: application/xml";


$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $site_url);
curl_setopt($ch, CURLOPT_HTTPHEADER, $header);
curl_setopt($ch, CURLOPT_USERAGENT, $user_agent);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);

$resultat = curl_exec($ch);

print_r($resultat);


function createSprdAuthHeader($method, $url)
{
    $apiKey = "my-api-key";
    $secret = "my-api-secret";
    $time = time()*1000;

    $data = "$method $url $time";
    $sig = sha1("$data $secret");

    return "Authorization: SprdAuth apiKey=\"$apiKey\", data=\"$data\", sig=\"$sig\"";
}