<?php

$url = "https://www.horizonte.com/microsites/german-in-germany-de";

$options  = array('http' => array('user_agent' => 'Xmsh673HhwbsgBCh2'));
$context  = stream_context_create($options);
$contents = file_get_contents($url, false,$context);
$contents = str_replace('src="/','src="https://www.horizonte.com/',$contents);
$contents = str_replace('href="/','href="https://www.horizonte.com/',$contents);
echo $contents;
?>