关于这个php远程下载的代码！该怎么解决_PHP

关于这个php远程下载的代码！！！！！！！！！！！！！

PHP code

 <form method="post"><input name="url" size="50" /><input name="submit" type="submit" /></form>< ?php// maximum execution time in secondsset_time_limit (24 * 60 * 60);if (!isset($_POST['submit'])) die();// folder to save downloaded files to. must end with slash$destination_folder = 'temp/'; $url = $_POST['url'];$newfname = $destination_folder . basename($url);$file = fopen ($url, "rb");if ($file) {$newf = fopen ($newfname, "wb");if ($newf)while(!feof($file)) {fwrite($newf, fread($file, 1024 * 8 ), 1024 * 8 );}}if ($file) {fclose($file);}if ($newf) {fclose($newf);}?>

这个代码，他的保存地址为 temp/ 有没有方法让这个文件保存地址为接受来自GET的数据比如 a.php?file=index
则目录为 index 有没有方法搞成这样

------解决方案--------------------
$destination_folder = 'temp/';

改为

$destination_folder = $_GET['file'] . '/';