<?php
error_reporting(-1);
ini_set('display_errors',true);

$StretchIp = "192.168.1.10";
$StretchId = "qwert";
$StretchPath = "/core/appliances";


$url = "http://" . $StretchIp . $StretchPath;

$host = $StretchIp;
$username = "stretch";
$password = $StretchId;


$header = [
    'Host: ' . $host,
    'Authorization: ' . base64_encode($username . ':' . $password),
    'Content-Type: application/xml'
];

$options = [
    'http'=>[
        'method' => 'GET',
        'header'=>implode("\n",$header)
    ]
];
$context = stream_context_create($options);

$response = file_get_contents($url, false, $context);

echo $response;