file_get_contents不适用于云存储[关闭]

<?php
include'vendor\autoload.php';
define("PROJECT_ID", 'projectname');
define("BUCKET_NAME", 'bucketname');
$content=file_get_contents('C:\Users\Useraccount\PhpstormProjects\Projectname\filename.txt);
echo($content);
?>

This is the code that is working well on localhost but I am not able to get file contents on cloud storage. It simply shows me an empty page. Which are the possible solutions to this problem?

You must get the url where the storage located online, example https://host.com/storage/mystorage/file.txt and store this on variable on php.

<?php
    $target_url = 'https://host.com/storage/mystorage/file.txt';

    echo file_get_contents($target_url);
?>