[php] 무조건 다운로드 받도록 header 세팅

function printDownloadHeader($filename, $filesize)
{
        global $HTTP_USER_AGENT;

        if( eregi("(MSIE 5.0|MSIE 5.1|MSIE 5.5|MSIE 6.0)", $HTTP_USER_AGENT) )
        {
                if(strstr($HTTP_USER_AGENT, "MSIE 5.5"))
                {
                        header("Content-Type: doesn/matter");
                        header("Content-Length: $filesize");
                        header("Content-Disposition: filename=$filename");
                        //header("Content-Transfer-Encoding: binary");
                        header("Expires: 120");
                        header("Cache-Control: cache, must-revalidate");
                }

                if(strstr($HTTP_USER_AGENT, "MSIE 5.0"))
                {
                        header("Content-type: file/unknown");
                        header("Content-Length: $filesize");
                        header("Content-Disposition: filename=$filename");
                        header("Expires: 120");
                        header("Cache-Control: cache, must-revalidate");
                }

                if(strstr($HTTP_USER_AGENT, "MSIE 5.1"))
                {
                        header("Content-type: file/unknown");
                        header("Content-Length: $filesize");
                        header("Content-Disposition: filename=$filename");
                        header("Expires: 120");
                        header("Cache-Control: cache, must-revalidate");
                }

                if(strstr($HTTP_USER_AGENT, "MSIE 6.0"))
                {
                        header("Content-type: file/unknown");
                        header("Content-Length: $filesize");
                        header("Content-Disposition: filename=$filename");
                        //header("Content-Transfer-Encoding: binary");
                        header("Expires: 120");
                        header("Cache-Control: cache, must-revalidate");
                }

        } else {
                header("Content-type: file/unknown");
                header("Content-Length: $filesize");
                header("Content-Disposition: filename=$filename");
                header("Expires: 120");
                header("Cache-Control: cache, must-revalidate");
        }
}