<?php
$username = "utente";
$password = "Password";
$apiKey = "chiaveApi";
$url = "https://www.brandsdistribution.com/";
//$url = "https://idt2015.rewix.zero11.net/";  #SandBox

$url .= "restful/export/api/products.xml";
$query = http_build_query([
        'acceptedlocales' => 'it_IT',
        'output-file' => 'xml',
        'since' => date("Y-m-d\TH:i:sO")
]);

$url = "$url?".$query;
echo $url;
$header = "Authorization: Basic " . base64_encode($apiKey . ':' . $password);
$xmlstr = <<<XML
<?xml version='1.0' standalone='yes'?>
<operations>
</operations>
XML;
$xml = new SimpleXMLElement($xmlstr);

$xmlOperation = $xml->addChild('operation');
$xmlOperation->addAttribute(‘type’, ‘lock’);

$xmlModel = $xmlOperation->addChild('model');
$xmlModel->addAttribute(‘stock_id’, 1);
$xmlModel->addAttribute(‘quantity’, 1);

$xmlText = $xml->asXML();


$ch = curl_init($url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_USERPWD, ($username . ':' . $password));
curl_setopt($ch, CURLOPT_HTTPHEADER,     array('Content-Type: application/xml','Accept: application/xml',$header));
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $xmlText);
$data = curl_exec($ch);
$httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
curl_close($ch);
echo $data;
?>