这应该会有所帮助:

$doc = new DOMDocument();
$doc->load('myxml.xml');
$arr = array();
foreach ($doc->getElementsByTagName('item') as $node) {
    $item = array ( 
        'title' => $node->getElementsByTagName('title')->item(0)->nodeValue,
        'date' => array()
    );

    foreach($node->getElementsByTagName('category') as $catNode)
    {
        $item['date'][] = $catNode->nodeValue;
    }

    $arr[] = $item;
}

• 基督徒