#native_company# #native_desc#
#native_cta#

PHP & Java Page 3

By Mark Nold
on December 20, 2000

Example 2: Using Xalan 1.2 to transform XML with XSLT

As another example of accessing Java objects in PHP, we will use the Xalan-java
XSLT engine from the Apache XML project. With this application, we can transform
XML source files using instructions in a XSL file. This allows for a great
number of interesting scenarios in the field of document processing and content
management.
To get started, we need to place both xerces.jar and xalan.jar files (included
in Xalan-Java version 1.2 from xml.apache.org) in your java.class.path, as defined
in your php.ini file.
The function xslt_transform() takes XML and XSL files as parameters and returns
the transformed output in a string.
XML and XSL parameters can be filenames (eg. foo.xml) or fully resolved URI’s
(eg. 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);

}

?>



Then, you can call this function as shown in the example below.
$xml contains a string with the fully resolved URL of XML file.
$xsl contains string with a XSL stylesheet URL containing rules for
conversion to generic HTML.
$out will contain a string with output, as a result of calling xslt_transform
described above.
This example parses a XML newsfeed containing the 5 latest articles on
phpbuilder.com. You are encouraged to also try other XML feeds and/or XSl
stylesheets.

<?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;

?>



If you are processing local files, make sure you use the full path name to pass to the Java class.

<?php

$xml    "/web/htdocs/xml_java/rss_feed.xml";

$xsl    "/web/htdocs/xml_java/rss_html.xsl";

$out xslt_transform($xml,$xsl);

echo 
$out;

?>



Although there are a number of other ways in PHP to achieve the same results,
the above example gives you a good idea of
the possibilities of accessing Java objects in PHP.