PHP文件下载 浏览器显示文件名乱码问题

<?php
$filename = "下载文件名";
$filesize = filesize('文件地址'); //获得文件大小
header('Pragma: public');
header('Last-Modified: '.gmdate('D, d M Y H:i:s') . ' GMT');
header('Cache-Control: no-store, no-cache, must-revalidate');
header('Cache-Control: pre-check=0, post-check=0, max-age=0');
header('Content-Transfer-Encoding: binary');
header('Content-Encoding: none');
header('Content-type: application/force-download');
header('Content-Disposition: attachment; filename="'.$filename.'"');
header('Content-length: '.$filesize);
?>

if (preg_match(’/MSIE/’,$_SERVER['HTTP_USER_AGENT'])) {
        $filename = rawurlencode($filename);
}