douwei2825
douwei2825
2015-07-19 15:07
浏览 175
已采纳

如何在PHP中使用DomDocument或XPath获取HTML文档的确切结构?

I have an HTML document for example:

<!DOCTYPE html>
<html>
<head>
    <title>Webpage</title>
</head>
<body>
<div class="content">
    <div>
        <p>Paragraph</p>
    </div>
    <div>
        <a href="someurl">This is an anchor</a>
    </div>
    <p>This is a paragraph inside a div</p>
</div>
</body>
</html>

I want to grab exact structure of the div having class of content.

Using DomDocument in PHP if I fetch the div using the getElementsByTagName() method, I am getting this:

    DOMElement Object
  (
    [tagName] => div
    [schemaTypeInfo] => 
    [nodeName] => div
    [nodeValue] => 

        Paragraph


        This is an anchor

    This is a paragraph inside a div

    [nodeType] => 1
    [parentNode] => (object value omitted)
    [childNodes] => (object value omitted)
    [firstChild] => (object value omitted)
    [lastChild] => (object value omitted)
    [previousSibling] => (object value omitted)
    [nextSibling] => (object value omitted)
    [attributes] => (object value omitted)
    [ownerDocument] => (object value omitted)
    [namespaceURI] => 
    [prefix] => 
    [localName] => div
    [baseURI] => 
    [textContent] => 

        Paragraph


        This is an anchor

    This is a paragraph inside a div

)

How can I get this instead:

<div class="content">
    <div>
        <p>Paragraph</p>
    </div>
    <div>
        <a href="someurl">This is an anchor</a>
    </div>
    <p>This is a paragraph inside a div</p>
</div>

Is there any way of doing this?

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1条回答 默认 最新

  • doujue6196
    doujue6196 2015-07-19 15:31
    已采纳

    Suppose, $str contains the HTML

    // Create DomDocument
    $doc = new DomDocument();
    $doc->loadHTML($str);
    // Find needed div
    $xpath = new DOMXpath($doc);
    $elements = $xpath->query('//div[@class = "content"]');
    // What to do if divs more that one?
    if ($elements->length != 1) die("some divs in the document have class 'content'");
    // Take first
    $div = $elements->item(0);
    // Echo content of node $div
    echo $doc->saveHTML($div);
    

    result

    <div class="content">
        <div>
            <p>Paragraph</p>
        </div>
        <div>
            <a href="someurl">This is an anchor</a>
        </div>
        <p>This is a paragraph inside a div</p>
    </div>
    
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