I have to work with a data base file data.xml and a stylesheet data.xsl for data.xml in docker. I put in a php file named fr.php this:

<?php

$xml = new DOMDocument;
$xml->load('data2.xml');

$xsl = new DOMDocument;
$xsl->load('data2.xsl');

$proc = new XSLTProcessor;
$proc->importStyleSheet($xsl);

echo $proc->transformToXML($xml);?>

After I run the program, the web page for that php file show that: Fatal error: Uncaught Error: Class “XSLTProcessor” not found in /var/www/html/fr.php:11 Stack trace: #0 {main} thrown in /var/www/html/fr.php on line 11

I have enabled in php.in the extension for xsl and the result is same. I’ve looked for answers on stack overflow but they don’t match, I’m working with xml in docker.