... Next . PHP 3 <= 3.0.18, PHP 4 >= 4.0.0) flush -- Flush the output buffer . ... Flushes the output buffers of PHP and whatever backend PHP is using (CGI, a web server, etc). ... Note: flush() has no effect on the buffering scheme of your webserver or the browser on the client side. Several servers, especially on Win32, will still buffer the output from your script until it terminates before transmitting the results to the browser. ... Even the browser may buffer its input before displaying it. ...