I'm just wondering, what is the right output of below code should be

ob_start(function($o) { fwrite(STDERR, $o); });
echo 'hello';

Does it should print "hello" or does it should print nothing?

In PHP 5.3, it prints hello, but in 5.4.0 it prints nothing.

Looking at the C code of PHP 5.4, it explicitly discards the output
buffer before calling the callback, except when flushing
or when using the internal callback handler.

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