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Filename : unserializeAnyXML.php
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<?PHP
/**
 * This example shows different methods how
 * XML_Unserializer can be used to create data structures
 * from XML documents.
 *
 * @author  Stephan Schmidt <schst@php.net>
 */
error_reporting(E_ALL);

// this is a simple XML document
$xml = '<users>' .
       '  <user handle="schst">Stephan Schmidt</user>' .
       '  <user handle="mj">Martin Jansen</user>' .
       '  <group name="qa">PEAR QA Team</group>' .
       '  <foo id="test">This is handled by the default keyAttribute</foo>' .
       '  <foo id="test2">Another foo tag</foo>' .
       '</users>';

require_once 'XML/Unserializer.php';

// complex structures are arrays, the key is the attribute 'handle' or 'name', if handle is not present
$options = array(
                 XML_UNSERIALIZER_OPTION_COMPLEXTYPE => 'array',
                 XML_UNSERIALIZER_OPTION_ATTRIBUTE_KEY => array(
                                                                  'user'     => 'handle',
                                                                  'group'    => 'name',
                                                                  '#default' => 'id'
                                                                )
                );

//  be careful to always use the ampersand in front of the new operator 
$unserializer = &new XML_Unserializer($options);

// userialize the document
$status = $unserializer->unserialize($xml, false);    

if (PEAR::isError($status)) {
    echo 'Error: ' . $status->getMessage();
} else {
    $data = $unserializer->getUnserializedData();
    echo '<pre>';
    print_r($data);
    echo '</pre>';
}


// unserialize it again and change the complexType option
// but leave other options untouched
// now complex types will be an object, and the property name will be in the
// attribute 'handle'
$status = $unserializer->unserialize($xml, false, array(XML_UNSERIALIZER_OPTION_COMPLEXTYPE => 'object'));

if (PEAR::isError($status)) {
    echo 'Error: ' . $status->getMessage();
} else {
    $data = $unserializer->getUnserializedData();
    echo '<pre>';
    print_r($data);
    echo '</pre>';
}

// unserialize it again and change the complexType option
// and reset all other options
// Now, there's no key so the tags are stored in an array
$status = $unserializer->unserialize($xml, false, array(XML_UNSERIALIZER_OPTION_OVERRIDE_OPTIONS => true, XML_UNSERIALIZER_OPTION_COMPLEXTYPE => 'object'));    

if (PEAR::isError($status)) {
    echo 'Error: ' . $status->getMessage();
} else {
    $data = $unserializer->getUnserializedData();
    echo '<pre>';
    print_r($data);
    echo '</pre>';
}
?>