php怎么取读xml文件

<?php
$doc = new DOMDocument();
$doc->load(&#39;books.xml&#39;);
$books = $doc->getElementsByTagName("book");
foreach ($books as $book) {
    $authors = $book->getElementsByTagName("author");
    $author = $authors->item(0)->nodeValue;
    $publishers = $book->getElementsByTagName("publisher");
    $publisher = $publishers->item(0)->nodeValue;
    $titles = $book->getElementsByTagName("title");
    $title = $titles->item(0)->nodeValue;
    echo "$title - $author - $publishern";
}
?>

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