Comment puis-je récupérer des données XML d'une base de données MySQL en utilisant PHP ?

// Connect to MySQL
mysql_connect('server', 'user', 'pass');
mysql_select_db('database');

// Query the database
$sql = "SELECT udid, country FROM table ORDER BY udid";
$res = mysql_query($sql);

// Initialize XMLWriter
$xml = new XMLWriter();

// Configure XML output
$xml->openURI("php://output");
$xml->startDocument();
$xml->setIndent(true);

// Create root element
$xml->startElement('countries');

// Loop through query results
while ($row = mysql_fetch_assoc($res)) {
    // Start country element
    $xml->startElement("country");

    // Add attributes
    $xml->writeAttribute('udid', $row['udid']);

    // Output country
    $xml->writeRaw($row['country']);

    // End country element
    $xml->endElement();
}

// End root element
$xml->endElement();

// Set output headers
header('Content-type: text/xml');

// Flush and output XML
$xml->flush();

<?xml version="1.0"?>
<countries>
 <country udid="1">Country 1</country>
 <country udid="2">Country 2</country>
 ...
 <country udid="n">Country n</country>
</countries>