ob_flush
PHP 4 >= 4.2.0, PHP 5, PHP 7, PHP 8
ob_flush - Flush (send) the output buffer
Manual
ob_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.
Parameters
This function has no parameters.
Return Values
Returns true on success or false on failure.