xml/xslt

In a previous life I used to do something like this:

$arguments = array('/_xml' => $xmlstring);
$xsltproc = xslt_create();
xslt_set_encoding ($xsltproc, "ISO-8859-1");
$html = xslt_process($xsltproc,'arg:/_xml',"myXSL.xsl",NULL,$arguments);
if (!$html) die('XSLT processing error: '.xslt_error($xsltproc));
xslt_free($xsltproc);
echo $html;

I am having some problems with the new way, sorta like this:

$proc = new xsltprocessor();

how do I tell the $proc object the xsl file to use?
and set the encoding?

$dom->loadxml('<?xml version="1.0" encoding="UTF-8"?>$xmlstring');

or something....

Kind regards
Kevin

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Kevin Waterson
Port Macquarie, Australia