(PHP 4 >= 4.2.0, PHP 5, PHP 7)
ob_flush — Flush (send) the output buffer
This function will send the contents of the output buffer (if any). If you want to further process the buffer's contents you have to call ob_get_contents() before ob_flush() as the buffer contents are discarded after ob_flush() is called.
This function does not destroy the output buffer like ob_end_flush() does.
No value is returned.