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php - 获取 exsl :node-set to work in PHP

我有以下PHP代码,但无法正常工作。我没有看到任何错误,但也许我只是瞎了眼。我在PHP5.3.1上运行它。HelloworldFooBartest@example.comHEREDOC;$xml_dom=newDOMDocument("1.0","utf-8");$xml_dom->appendChild($xml_dom->createElement("dummy"));$xsl_dom=newDOMDocument();$xsl_dom->loadXML($xsl_string);$xsl_processor=newXSLTProcessor();$xsl_processor->i