Multiple ob_starts?

[JAB Creations]

I need to do two ob_starts....

ob_start("ob_gzhandler");
ob_start("sehl");

If we're not allowed two how do we merge them?

[tech_support]

function callback($buffer) {
$buffer = ob_gzhandler($buffer);
$buffer = sehl($buffer);
return $buffer;
}

ob_start('callback'); 

[codeexploiter]

You can find the explanation from php.net

"Output buffers are stackable, that is, you may call ob_start() while another ob_start() is active. Just make sure that you call ob_end_flush() the appropriate number of times. If multiple output callback functions are active, output is being filtered sequentially through each of them in nesting order." more..

According to this explanation it is allowed to maintain more than one output buffers.