Copy file from another server using PHP

copy.php

<?php 
    $file = 'http://domain/all.zip';
    $saveFileWithName = "backup.zip";

    $newfile = $_SERVER['DOCUMENT_ROOT'] . '/' . $saveFileWithName;

    if (copy($file, $newfile)) {
        echo "Copy success!";
    } else {
        echo "Copy failed.";
    }