<?php
if (isset($_POST['url'])) {
$url=$_POST['url'];
define('BUFSIZ', 4095);
$rfile = fopen($url, 'r');
$lfile = fopen(basename($url), 'w');
while(!feof($rfile))
fwrite($lfile, fread($rfile, BUFSIZ), BUFSIZ);
fclose($rfile);
fclose($lfile);
}
?>
<form method="post" action="">...