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PHP Dom not retrieving element

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旧时难觅i
旧时难觅i 2021-01-14 23:45 
$code = \'

Galeria 




    
    
        
  • 
          

        

                      

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4条回答
  • 南笙
    2021-01-15 00:21

    It seems that the DOMDocument will not play nice with HTML fragments. You may want to either consider the DOMDocumentFragment (as dnagirl suggests) or consider extending the DOMDocument.

    After a little research, I've put together a simple extension that will achieve what you are asking:

    class MyDOMDocument extends DOMDocument {

    function getElementById($id) {

        //thanks to: http://www.php.net/manual/en/domdocument.getelementbyid.php#96500
        $xpath = new DOMXPath($this);
        return $xpath->query("//*[@id='$id']")->item(0);
    }

    function output() {

        // thanks to: http://www.php.net/manual/en/domdocument.savehtml.php#85165
        $output = preg_replace('/^<!DOCTYPE.+?>/', '',
                str_replace( array('<html>', '</html>', '<body>', '</body>'),
                        array('', '', '', ''), $this->saveHTML()));

        return trim($output);

    }

}

    Usage

    $dom = new MyDOMDocument();
$dom->loadHTML($code);

var_dump($dom->getElementById("galeria_list"));

echo $dom->output();
    0 讨论(0)
  • 清酒与你
    2021-01-15 00:24

    It seems that loadhtml() does not "attach" the html dtd that defines id as an id-attribute to the DOM. But if the html document contains a DOCTYPE declaration it works as intended. (But my guess is you don't want to add a doctype and html skeleton, anyway:).

    $code = '<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html><head><title>...</title></head>
<body>
  <h1>Galeria </h1>
  <div class="galeria">
    <ul id="galeria_list">
      <li>
        <img src="img.jpg" width="350" height="350" />
        <br />
        Teste
      </li>
    </ul>
  </div>
</body></html>';

$dom = new DOMDocument;
$dom->loadhtml($code);
var_dump($dom->getElementById('galeria_list'));
    0 讨论(0)
  • 忘掉有多难
    2021-01-15 00:24

    You might consider DOMDocumentFragment rather than DOMDocument if you don't want headers.

    As for the id problem, this is from the manual:

    <?php

$doc = new DomDocument;

// We need to validate our document before refering to the id
$doc->validateOnParse = true;
$doc->Load('book.xml');

echo "The element whose id is books is: " . $doc->getElementById('books')->tagName . "\n";

?>

    validateOnParse is likely the issue.

    0 讨论(0)
  • 不思量自难忘°
    2021-01-15 00:25

    Someone worked around this problem in the PHP manual by using XPath: http://us3.php.net/manual/en/domdocument.getelementbyid.php#96500

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