PHP中文文件名输出乱码解决方法

$file_name="我的文件.jpg";
$file_name=iconv("utf-8","gb2312",$file_name); //解决中文乱码问题
echo '$file_name';

//执行创建中文名html文件
file_put_contents(PHPCMS_PATH.'test/'.iconv('UTF-8', 'GBK', '中文名').'.html', 'xxxxxxxxxxx');

?>

$sFileName = "sda.php";
$sOriginalFileName = $sFileName;
$sExtension = s str($sFileName, (strrpos($sFileName, '.') + 1));//找到扩展名
$sExtension = strtolower($sExtension);
$sFileName = date("YmdHis").rand(100, 200).".".$sExtension; //这样就是我们的新文件名了，全数字的不会有乱码了哦。

$file = "/tmp/中文名.tar.gz";

$filename = basename($file);

header("Content-type: application/octet-stream");

//处理中文文件名
$ua = $_SERVER["HTTP_USER_AGENT"];
$encoded_filename = urlencode($filename);
$encoded_filename = str_replace("+", "%20", $encoded_filename);
if (preg_match("/MSIE/", $ua)) {
header('Content-Disposition: attachment; filename="' . $encoded_filename . '"');
} else if (preg_match("/Firefox/", $ua)) {
header("Content-Disposition: attachment; filename*="utf8''" . $filename . '"');
} else {
header('Content-Disposition: attachment; filename="' . $filename . '"');
}

header('Content-Disposition: attachment; filename="' . $filename . '"');
header("Content-Length: ". filesize($file));
readfile($file);