// Load the XML source
$xml = new DOMDocument('1.0','utf-8');
$xml->load('collection.xml');

$xsl = new DOMDocument('1.0','utf-8');
$xsl->load('collection.xsl');

// Configure the transformer
$proc = new XSLTProcessor;
$proc->importStyleSheet($xsl); // attach the xsl rules

echo $proc->transformToDoc($xml)->saveHTML();
echo PHP_EOL;

echo $proc->transformToDoc($xml)->saveXML();
echo PHP_EOL;

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

  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>

<?xml version="1.0" encoding="iso-8859-1" standalone="yes"?>

  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/>

  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>