(PHP 4 >= 4.2.0, PHP 5, PHP 7)
ob_flush — Flush (send) the output buffer
ob_flush ( ) : void
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.
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https://www.php.net/manual/en/function.ob-flush.php