CODEWITHSUNDEEP
phpxmldomdocumentgetelementsbytagname
Milos Cuculovic
Milos Cuculovic

Reputation: 20223

Why the getElementsByTagName is not working in this example

I have an DomElement with this content:

$cell =  <td colspan=3>
             <p class=5tablebody>
                 <span style='position:relative;top:14.0pt'>
                     <img width=300 height=220 src="forMerrin_files/image020.png">
                 </span>
             </p>
         </td>

There, I am geting the p element with:

$paragraphs = $xpath->query('.//p', $cell);

My goal is to get the img element from the cell element.

I have tried: 

$paragraph->getElementsByTagName('img')->item(0);

But I am getting null. Any idea why?

Thank you

Upvotes: 0

Views: 448

Answers (2)

ThW
ThW

Reputation: 19482

The second argument of DOMXpath::query() has to be a context node, you can not just use some HTML string. I suggest using DOMXpath::evaluate() anyway. The syntax of both methods is the same, but query() is limited to Xpath expressions that return a node list, evaluate() allows Xpath expressions that return scalars, too.

$html = <<<HTML
  <td colspan=3>
    <p class=5tablebody>
      <span style='position:relative;top:14.0pt'>
        <img width=300 height=220 src="forMerrin_files/image020.png">
      </span>
    </p>
  </td>
HTML;

$dom = new DOMDocument();
$dom->loadHtml($html);
$xpath = new DOMXpath($dom);

// for each td element
foreach ($xpath->evaluate('//td') as $cell) {
  // for each img inside a p
  foreach ($xpath->evaluate('.//p//img', $cell) as $img) {
    var_dump($img->getAttribute('src')); 
  }
}

Output: https://eval.in/147576

string(28) "forMerrin_files/image020.png"

Upvotes: 1

Latheesan
Latheesan

Reputation: 24116

Is this what you after?

$htmlStr = '<td colspan=3>
             <p class=5tablebody>
                 <span style=\'position:relative;top:14.0pt\'>
                     <img width=300 height=220 src="forMerrin_files/image020.png">
                 </span>
             </p>
         </td>';

$doc = new DOMDocument();
$doc->loadHTML($htmlStr);

$paragraphs = $doc->getElementsByTagName('img');
var_dump($paragraphs->item(0)->getAttribute('src'));

Outputs:

string 'forMerrin_files/image020.png' (length=28)

Upvotes: 1

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