DocBook XSL and Php, Chunking

Dear all,
I´ve been playing around with my XAMPP (PHP Version 5.0.5,
Apache), DocBook and one of the latest XSL Snapshots. For
the non-chunked version of the html output, the
transformation from DB->HTML works fine. But when I try
to use the xsl-based chunking, Apache crashes. 
This makes sense to me as I use a outfile file e.g. 

	$output_file = $xsltproc ->transformToXml($xml);
	file_put_contents("output/".
basename($xml_file,".xml") .".htm",
$output_file);

I'm no expert on php. Has someone a solution how make
php's build-in xsltproc work together with xsl-based
chunking?
Thanks.
Ludger Thomas

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