ob_flush Flush (send) the output buffer voidob_flush 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. See also ob_get_contents, ob_clean, ob_end_flush and ob_end_clean.