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XSL 2.0 Transpiler in PHP

1.0.6 2021-07-19 09:03 UTC


XSL 2.0 Transpiler in PHP.


Requires PHP 7.2 or later. For PHP 5.6+ use version 0.6. It is installable and autoloadable via Composer as genkgo/xsl.


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To run the unit tests at the command line, issue ./vendor/bin/phpunit -c phpunit.xml. This library attempts to comply with PSR-1, PSR-2, and PSR-4. If you notice compliance oversights, please send a patch via pull request.

Getting Started

Replace XSLTProcessor with Genkgo\Xsl\XsltProcessor, change version="1.0" in version="2.0" and you are done!

use Genkgo\Xsl\XsltProcessor;
use Genkgo\Xsl\Cache\NullCache;

$xslDoc = new DOMDocument();

$xmlDoc = new DOMDocument();

$transpiler = new XsltProcessor(new NullCache());
echo $transpiler->transformToXML($xmlDoc);

Create your own extenions

You can also register your own extensions. Just implement the XmlNamespaceInterface and you are ready to use your own element transformations and xpath functions. See the example below and the integration test to understand how it works.

// use omitted for readability

class MyExtension implements XmlNamespaceInterface {

    const URI = '';

    public function register(TransformerCollection $transformers, FunctionCollection $functions) {
            new class extends AbstractLazyFunctionMap {
                public function newFunctionList(): array
                    return [
                        'hello-world' => ['newStringFunction', MyExtension::class],

    public static function helloWorld(Arguments $arguments) {
        return 'Hello World was called and received ' . count($arguments->unpack()) . ' arguments!';


$factory = new ProcessorFactory(new NullCache(), [new MyExtension()]);
$processor = $factory->newProcessor();

and then call the function in your style sheet.

<xsl:stylesheet version="2.0"

    <xsl:output omit-xml-declaration="yes" />

    <xsl:template match="/">
        <xsl:value-of select="my:hello-world(1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10)" />


will yield: Hello World was called and received 20 arguments!.

Caching: transpile once

Depending on the complexity of your stylesheet, the transpiling process could slow down the processing of your document. Therefore, you probably want to cache the result stylesheet. By adding psr/simple-cache to your composer.json, you will add the possibility to enable caching. See the example below, or the integration test to see how it works.

use Genkgo\Xsl\Cache\ArrayCache;
use Genkgo\Xsl\ProcessorFactory;

$factory = new ProcessorFactory(new ArrayCache());
$processor = $factory->newProcessor();


  • Found a bug? Please try to solve it yourself first and issue a pull request. If you are not able to fix it, at least give a clear description what goes wrong. We will have a look when there is time.
  • Want to see a feature added, issue a pull request and see what happens. You could also file a bug of the missing feature and we can discuss how to implement it.