PHP disabling ouput buffering

Question

I\'ve turned off the output buffering in PHP by setting output_buffering = off in php.int but when runnng the simple code like that:

Answer 1

Try adding flush() and ob_flush() see at php.net

will look something like this

<?php
echo "Hello ";
ob_flush();
flush();
sleep(3);
echo "World";
?>

Answer 2

Ok, It seems that I've resolved the issue. The secret was setting implicit_flush to On in php config file. But that raised a question for me. In such a case what's output_buffering option for since it doesn't work as in my example?