вот попробуй
$file = str_replace('erovideo.mobi/save.php?id=', 'save.php?id=', $file);Внутри save.php
$id = intval($_GET['id']);
$url = 'http://erovideo.mobi/save.php?id='.$id;
$get = get_headers($url, 1);
foreach($get as $t => $k){
header($t.': '.$k);
}
header('Content-Disposition: attachment; filename='.$_SERVER['HTP_HOST'].'_'.basename($get['Location']));
readfile($get['Location']);