PHP. Руководство по PHP. 2005
ob_implicit_flush
ob_implicit_flush
Description
void ob_implicit_flush ([int flag])ob_implicit_flush() will turn implicit
flushing on or off (if no flag is given,
it defaults to on). Implicit flushing will result in a flush
operation after every output call, so that explicit calls to
flush() will no longer be needed.
Turning implicit flushing on will disable output buffering, the
output buffers current output will be sent as if
ob_end_flush() had been called.
See also flush(),
ob_start(), and
ob_gzhandler
ob_list_handlers
Отвечу на любые вопросы. С уважением, Дмитрий Владимирович.