defeat buffered output in PHP for realtime display?

[aww]

Some of the tricks I try to use in PHP to typically defeat the output buffering to diagnose the output of long scripts does not seem to be working with LiteSpeed.

I suspect this is because LiteSpeed tries to gather the output so it can compress+chunk it (typically in 4k blocks).

Is there any trick I can use to defeat the buffer effect on a per-script basis?

None of these solve the problem:
ini_set('output_buffering', 0);
ini_set('implicit_flush', 1);
ob_end_flush();