例子二：通過Xalan 1.2，使用XSLT轉換XML
做為第二個例子，我們使用了Xalan-java的XSLT引擎，這個引擎來自於APACHE的XML專案，使用這個程式，我們能夠使用XSL轉換XML原始檔。這將極大的方便我們處理文件和進行內容管理。
開始之前，我們需要將xerces.jar 和 xalan.jar檔案放入java.class.path目錄下（這兩個檔案包含在Xalan-Java 1.2 中，可以從xml.apache.org處下載）。
PHP程式如下：
函式xslt_transform()以XML和XSL檔案為引數，形式可為檔名（如:foo.xml）或URL（如：http://localhost/foo.xml）。
<?php
function xslt_transform($xml,$xsl) {
// Create a XSLTProcessorFactory object. XSLTProcessorfactory is a Java
// class which manufactures the processor for performing transformations.
$XSLTProcessorFactory = new java("org.apache.xalan.xslt.XSLTProcessorFactory");
// Use the XSLTProcessorFactory method getProcessor() to create a
// new XSLTProcessor object.
$XSLTProcessor = $XSLTProcessorFactory->getProcessor();
// Use XSLTInputSource objects to provide input to the XSLTProcessor
// process() method for transformation. Create objects for both the
// xml source as well as the XSL input source. Parameter of
// XSLTInputSource is (in this case) a ‘system identifier’ (URI) which
// can be an URL or filename. If the system identifier is an URL, it
// must be fully resolved.
$xmlID = new java("org.apache.xalan.xslt.XSLTInputSource", $xml);
$stylesheetID = new java("org.apache.xalan.xslt.XSLTInputSource", $xsl);
// Create a stringWriter object for the output.
$stringWriter = new java("java.io.StringWriter");
// Create a ResultTarget object for the output with the XSLTResultTarget
// class. Parameter of XSLTResultTarget is (in this case) a ‘character
// stream’, which is the stringWriter object.
$resultTarget = new java("org.apache.xalan.xslt.XSLTResultTarget", $stringWriter);
// Process input with the XSLTProcessors’ method process(). This
// method uses the XSL stylesheet to transform the XML input, placing
// the result in the result target.
$XSLTProcessor->process($xmlID,$stylesheetID,$resultTarget);
// Use the stringWriters’ method toString() to
// return the buffer’s current value as a string to get the
// transformed result.
$result = $stringWriter->toString();
$stringWriter->close();
return($result);
}
?>
函式定義好後，我們就可以呼叫它了，在下面的例程中，變數$xml指向一個URL字串，$xsl也是如此。這個例子將顯示5個最新的phpbuilder.com文章標題。
<?php
$xml = "http://www.phpbuilder.com/rss_feed.php?type=articles&limit=5";
$xsl = "http://www.soeterbroek.com/code/xml/rss_html.xsl";
$out = xslt_transform($xml,$xsl);
echo $out;
?>
如果你在本地機上執行程式，必須確保你的函式引數指向正確的檔名。
<?php
$xml = "/web/htdocs/xml_java/rss_feed.xml";
$xsl = "/web/htdocs/xml_java/rss_html.xsl";
$out = xslt_transform($xml,$xsl);
echo $out;
?>
雖然這種效果我們可以通過其它方法實現，或許那些方法更好，但這個例子能讓你對PHP呼叫JAVA類有一個更好的瞭解。
教程結束了，希望你能夠從這篇教程中學到點東西，以下是一些你用得到的連結：
http://www.php4win.de ~ A great Win32 distribution of PHP
http://www.javasoft.com ~ Sun’s Java release
http://www.jars.com ~ Start searching for handy Java classes
http://www.gamelan.com ~ More Java classes
http://www.technetcast.com/tnc_play_stream.html?stream_id=400 ~ Sam Ruby about PHP and Java integration at Open Source Convention 2000 (audio)
http://xml.apache.org ~ Apache XML Project
http://www.phpbuilder.com/columns/justin20001025.php3 ~ Transforming XML with XSL using Sablotron