php生成xml文件

<?php
$books = array();
$books[] = array(
    &#39;title&#39; => &#39;PHP Hacks&#39;,
    &#39;author&#39; => &#39;Jack Herrington&#39;,
    &#39;publisher&#39; => "O&#39;Reilly"
);
$books[] = array(
    &#39;title&#39; => &#39;Podcasting Hacks&#39;,
    &#39;author&#39; => &#39;Jack Herrington&#39;,
    &#39;publisher&#39; => "O&#39;Reilly"
);
$doc = new DOMDocument();
$doc->formatOutput = true;
$r = $doc->createElement("books");
$doc->appendChild($r);
foreach ($books as $book) {
    $b = $doc->createElement("book");
    $author = $doc->createElement("author");
    $author->appendChild($doc->createTextNode($book[&#39;author&#39;]));
    $b->appendChild($author);
    $title = $doc->createElement("title");
    $title->appendChild($doc->createTextNode($book[&#39;title&#39;]));
    $b->appendChild($title);
    $publisher = $doc->createElement("publisher");
    $publisher->appendChild($doc->createTextNode($book[&#39;publisher&#39;]));
    $b->appendChild($publisher);
    $r->appendChild($b);
}
echo $doc->saveXML();
?>

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