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 (http://www.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.. (http://in.php.net/manual/en/function.ob-start.php)

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