(PHP >= 8.4.0)
XSLTProcessor::registerPHPFunctionNS — Register a PHP function as namespaced XSLT function
$namespaceURI, string $name, callable $callable): voidThis method enables the ability to use a PHP function as a namespaced XSLT functions within XSL stylesheets.
namespaceURIThe URI of the namespace.
nameThe local function name inside the namespace.
callableThe PHP function to call when the XSL function gets called within the stylesheet. When a node list is passed as parameter to the callback, the argument becomes an array containing the matched dom nodes.
Throws a ValueError if a callback name is not valid.
Throws a ValueError if
options contains an invalid option.
Throws a ValueError if
overrideEncoding is an unknown encoding.
Throws a TypeError if a given callback is not callable.
No value is returned.
Example #1 Simple PHP Function call from a stylesheet
<?php
$xml = <<<EOB
<allusers>
<user>
<uid>bob</uid>
</user>
<user>
<uid>joe</uid>
</user>
</allusers>
EOB;
$xsl = <<<EOB
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:my="urn:my.ns">
<xsl:output method="html" encoding="utf-8" indent="yes"/>
<xsl:template match="allusers">
<html><body>
<h2><xsl:value-of select="my:count(user/uid)" /> users</h2>
<table>
<xsl:for-each select="user">
<tr>
<td>
<xsl:value-of select="my:uppercase(string(uid))"/>
</td>
</tr>
</xsl:for-each>
</table>
</body></html>
</xsl:template>
</xsl:stylesheet>
EOB;
$xmldoc = new DOMDocument();
$xmldoc->loadXML($xml);
$xsldoc = new DOMDocument();
$xsldoc->loadXML($xsl);
$proc = new XSLTProcessor();
$proc->registerPHPFunctionNS('urn:my.ns', 'uppercase', strtoupper(...));
$proc->registerPHPFunctionNS('urn:my.ns', 'count', fn (array $arg1) => count($arg1));
$proc->importStyleSheet($xsldoc);
echo $proc->transformToXML($xmldoc);
?>