PHP: Leer un XML usando DOMDocument

Dejo a disposición un ejemplo sencillo de como leer un XML con la clase DOMDocument.

XML:

<catalog>
<catalog-name>My Favorite Music</catalog-name>
<cd id="cd-001">
<title value="Empire Burlesque" />
<artist value="Bob Dylan" />
<country value="USA" />
<company value="Columbia" />
<price value="10.90" />
<year value="1985" />
</cd>
<cd id="cd-002">
<title value="Hide your heart" />
<artist value="Bonnie Tyler" />
<country value="UK" />
<company value="CBS Records" />
<price value="9.90" />
<year value="1988" />
</cd>
<cd id="cd-003">
<title value="Greatest Hits" />
<artist value="Dolly Parton" />
<country value="USA" />
<company value="RCA" />
<price value="9.90" />
<year value="1982" />
</cd>
</catalog>

Código:

<?php
$cdCatalogXMLReader = new CDCatalogXMLReader();
$cdCatalogXMLReader->showCatalogAsTable('cd-catalog.xml');

class CDCatalogXMLReader {
public function showCatalogAsTable($xmlPath) {
 // Loads XML.
 $doc = new DOMDocument();
 $doc->load($xmlPath); 

 // Reading tag's value.
 $title = $doc->getElementsByTagName("catalog-name")
     ->item(0)->nodeValue;

 echo "<h1>$title</h1>";

 // Reading all elements with tag name="cd".
 $cds = $doc->getElementsByTagName( "cd" ); 
 echo '<table border="1">';
 echo '<tr><th>ID</th><th>Title</th><th>Artist</th><th>Country</th><th>Company</th><th>Price</th><th>Year</th></tr>';

 foreach ($cds as $cd) {        
  echo '<tr>';
  // Reading attributes.
  echo '<td>' . $cd->getAttribute('id') . '</td>';
  echo '<td>' . $cd->getElementsByTagName("title")->item(0)->getAttribute('value') . '</td>';
  echo '<td>' . $cd->getElementsByTagName("artist")->item(0)->getAttribute('value') . '</td>';
  echo '<td>' . $cd->getElementsByTagName("country")->item(0)->getAttribute('value') . '</td>';
  echo '<td>' . $cd->getElementsByTagName("company")->item(0)->getAttribute('value') . '</td>';
  echo '<td>' . $cd->getElementsByTagName("price")->item(0)->getAttribute('value') . '</td>';
  echo '<td>' . $cd->getElementsByTagName("year")->item(0)->getAttribute('value') . '</td>';
  echo '</tr>';  
 }
 echo '</table>'; 
}
}
?>

Salida:

My Favorite Music

ID	Title	Artist	Country	Company	Price	Year
cd-001	Empire Burlesque	Bob Dylan	USA	Columbia	10.90	1985
cd-002	Hide your heart	Bonnie Tyler	UK	CBS Records	9.90	1988
cd-003	Greatest Hits	Dolly Parton	USA	RCA	9.90	1982