使用 DomDocument 将实体添加到 DOCTYPE

Question

我正在尝试创建一个看起来像这样的 XML 文档...

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE stylesheet  [
    <!ENTITY nbsp   "&#160;">
    <!ENTITY copy   "&#169;">
    <!ENTITY reg    "&#174;">
    <!ENTITY trade  "&#8482;">
    <!ENTITY mdash  "&#8212;">
    <!ENTITY ldquo  "&#8220;">
    <!ENTITY rdquo  "&#8221;"> 
    <!ENTITY pound  "&#163;">
    <!ENTITY yen    "&#165;">
    <!ENTITY euro   "&#8364;">
]>
<NewsPost>
    <Post>
        <PermaLink>http://news.bradfordastronomy.co.uk/?p=92</PermaLink>
        <Title>Change of Venue for Monday Meetings until March 2015</Title>
        <Content>Due to building work at Eccleshill library, the Monday meetings will be held at     Upper Bolton Conservative Club, Idle Road, Bradford, BD2 4JN.&#13;
&#13;
&nbsp;&#13;
&#13;
&nbsp;&#13;
&#13;
&lt;span style="color: #ffff00"&gt;&lt;strong&gt;Update &lt;/strong&gt;&lt;/span&gt;&#13;
&#13;
The building work is taking longer than expected; however, we hope to be back at the Library by     the end of March 2015.</Content></Post></NewsPost>

我想用 PHP 来做这件事。我目前的代码是这样的......

    $imp = new DOMImplementation;

    $dtd = $imp->createDocumentType('stylesheet', '', '');

    $domDoc = new DOMDocument('1.0', 'utf-8');
    $domDoc->preserveWhiteSpace = false;

    require_once(newsFolder.'/wp-blog-header.php'); 
    //global $post;
    $args = array( 'posts_per_page' => 1 );
    $myposts = get_posts( $args );


    $rootElement = $domDoc->createElement('NewsPost');
    $domDoc->appendChild($rootElement); 

    foreach( $myposts as $post ) : setup_postdata($post);
        $postNode = $domDoc->createElement("Post");
        $rootElement->appendChild($postNode);

        $permaLinkNode = $domDoc->createElement("PermaLink",get_permalink());
        $postNode->appendChild($permaLinkNode);

        $titleNode = $domDoc->createElement("Title",get_the_title());
        $postNode->appendChild($titleNode);

        //$contentNode = $domDoc->createElement("Excerpt",get_the_excerpt());
        //$postNode->appendChild($contentNode);

        $contentNode = $domDoc->createElement("Content",get_the_content());
        $postNode->appendChild($contentNode);
    endforeach;

    $domDoc->save(cacheFolder.'LatestWordPressEntry.xml');

    unset($domDoc);

您会注意到没有将标签添加到 !DOCTYPE 的代码

我在网上找遍了，找不到最佳实践方法。我真的不想求助于将 XML 保存为字符串，然后进行字符串替换（这总是一个巨大的障碍）

对此的任何帮助将不胜感激。

基本上，我正在寻找转向

<!DOCTYPE stylesheet>

标记到

<!DOCTYPE stylesheet  [
    <!ENTITY nbsp   "&#160;">
    <!ENTITY copy   "&#169;">
    <!ENTITY reg    "&#174;">
    <!ENTITY trade  "&#8482;">
    <!ENTITY mdash  "&#8212;">
    <!ENTITY ldquo  "&#8220;">
    <!ENTITY rdquo  "&#8221;"> 
    <!ENTITY pound  "&#163;">
    <!ENTITY yen    "&#165;">
    <!ENTITY euro   "&#8364;">
]>

Answer 1

DOM 不是用于构建文档类型定义的接口，这就是为什么您找不到将实体声明等内容添加到内部子集的方法的原因。如果你必须内联它而不是使用外部子集，你将不得不将它作为一个完整的字符串提供并相应地加载它。

---

示例：

$xml = <<<'XML'
<!DOCTYPE stylesheet  [
    <!ENTITY nbsp   "&#160;">
    <!ENTITY copy   "&#169;">
    <!ENTITY reg    "&#174;">
    <!ENTITY trade  "&#8482;">
    <!ENTITY mdash  "&#8212;">
    <!ENTITY ldquo  "&#8220;">
    <!ENTITY rdquo  "&#8221;">
    <!ENTITY pound  "&#163;">
    <!ENTITY yen    "&#165;">
    <!ENTITY euro   "&#8364;">
]>
<NewsPost/>
XML;

$dom = new DOMDocument();
$dom->loadXML($xml);

echo $dom->saveXML();

---

输出：

<?xml version="1.0"?>
<!DOCTYPE stylesheet [
<!ENTITY nbsp "&#160;">
<!ENTITY copy "&#169;">
<!ENTITY reg "&#174;">
<!ENTITY trade "&#8482;">
<!ENTITY mdash "&#8212;">
<!ENTITY ldquo "&#8220;">
<!ENTITY rdquo "&#8221;">
<!ENTITY pound "&#163;">
<!ENTITY yen "&#165;">
<!ENTITY euro "&#8364;">
]>
<NewsPost/>