如何通过htaccess或PHP设置“PHP output_buffering On”？

Question

My site is on a shared server, no access to php.ini and output buffering is set as no value.

I have also tried this .htacces but no help (tried without third line as well):

1.   <IfModule mod_php5.c>
2.   php_flag output_buffering On
3.   php_value output_buffering 8192
4.   php_value output_handler mb_output_handler
5. </IfModule>

I actually need it as I want to call ob_start() before a header location in middle of a PHP Page as it is sending me - Header already started error.

Thanks in advance.

---

Also, if someone can help me with a javascript based script which autodownload an exe file on page load (Without any extra page pop up).

---

Script I am using is:

           // <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
           .
           .
           .
           // Sending Mails and other stuff

           if ($mail->send()) {
                $alertSuccess = 1;
                $alertMsg = "Your license has been sent succesfully.";

                ## Download Installer
                $folder = "license";
                $file = "Setupn.msi";
                ob_start();
                header("Content-disposition: attachment; filename=$file");
                header("Content-type: application/octet-stream");
                ob_clean();
                flush();
                readfile("$folder/$file");
            }

Answer 1

I think you want that

       if ($mail->send()) {
            $alertSuccess = 1;
            $alertMsg = "Your license has been sent succesfully.";

            ## Download Installer
            $folder = "license";
            $file = "Setupn.msi";
            ob_clean(); // clear your current output and set headers for your download
            // its not possible to remove already setted headers with ob_clean
            header("Content-disposition: attachment; filename=$file");
            header("Content-type: application/octet-stream");
            flush();
            readfile("$folder/$file");
            exit; // i prefere an exit here, to stop all other scripts
        }

i prefere to output a normal page with your message and then redirect your user via js to your download.