Transform to XML

# XSLTProcessor::transformToXml

(PHP 5, PHP 7, PHP 8)

XSLTProcessor::transformToXml — Transform to XML

### Description

public XSLTProcessor::transformToXml(object `$document`): string|null|false

Transforms the source node to a string applying the stylesheet given by the xsltprocessor::importStylesheet() method.

### Parameters

`document`

  The Dom\Document, DOMDocument, SimpleXMLElement or libxml-compatible object to be transformed.

`returnClass`

  This optional parameter may be used so that XSLTProcessor::transformToDoc() will return an object of the specified class. That class should either extend or be the same class as `document`'s class.

### Errors/Exceptions

The following errors are possible when using an expression that invokes PHP callbacks.

- Throws an Error if a PHP callback is invoked but there were no callbacks registered, or if the named callback was not registered.
- Throws a TypeError if the `php:function` syntax is used and the handler name is not a string.
- Throws an Error if a non-DOM object was returned from a callback.

### Return Values

The result of the transformation as a string or `false` on error.

### Changelog

Version | Description
--- | ---
8.4.0 | Now throws an Error if the callback cannot be invoked, instead of emitting a warning.
8.4.0 | Added support for Dom\Document.

### Examples

Example #1 Transforming to a string

`<?php
// Load the XML source
$xml = new DOMDocument;
$xml->load('collection.xml');
$xsl = new DOMDocument;
$xsl->load('collection.xsl');
// Configure the transformer
$proc = new XSLTProcessor;
$proc->importStyleSheet($xsl); // attach the xsl rules
echo $proc->transformToXML($xml);
?>`

The above example will output:

    Hey! Welcome to Nicolas Eliaszewicz's sweet CD collection!

    <h1>Fight for your mind</h1><h2>by Ben Harper - 1995</h2><hr>
    <h1>Electric Ladyland</h1><h2>by Jimi Hendrix - 1997</h2><hr>

Example #2 Transforming to a string using Dom\Document

`<?php
$xml = Dom\XMLDocument::createFromFile('collection.xml');
$xsl = Dom\XMLDocument::createFromFile('collection.xsl');
// Configure the transformer
$proc = new XSLTProcessor;
$proc->importStyleSheet($xsl); // attach the xsl rules
echo $proc->transformToXML($xml);
?>`

The above example will output:

    Hey! Welcome to Nicolas Eliaszewicz's sweet CD collection!

    <h1>Fight for your mind</h1><h2>by Ben Harper - 1995</h2><hr>
    <h1>Electric Ladyland</h1><h2>by Jimi Hendrix - 1997</h2><hr>

### See Also

- XSLTProcessor::transformToDoc() - Transform to a document
- XSLTProcessor::transformToUri() - Transform to URI

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