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Editorial Team
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Asked: 2026-05-23T18:10:18+00:00

I need a regular expression find and replace that I’m a little stuck on.

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I need a regular expression find and replace that I’m a little stuck on.

Basically, I have a table with several <td>‘s
in each <td> i have a<img>

I need to copy the width and height from the <img> and place it in the <td>

I have been doing this manually, however the number of <td>‘s is growing and its taking to long.

I just need help doing the actual find and replace

any ideas?

— EDIT —

Thanks for the advice, Think I will go down the dom route as I know it better.
I have done reg ex before which did a task which was a much more simple idea so just went from there. You’ve saved me some time

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1 Answer

  1. Editorial Team

    You should consider using the DOMDocument class provided by PHP.

    Example:

    <?php

$doc = new DOMDocument;
$doc->loadHTMLFile('/path/to/file.html');

// Find the TD elements.
$tds = $doc->getElementsByTagName('td');

// If TD elements were found, loop through each one of them.
if ( ! empty($tds) )
  foreach ( $tds as $td )
  {
    // Find the IMG elements located inside that TD
    $imgs = $td->getElementsByTagName('img');

    // Find the style attribute of the TD just in case one already exists.
    $style = $td->getAttribute('style');
    
    // I'm not sure what to do if multiple images are found so instead of looping to many, make sure only 1 is found.
    if ( ! empty($imgs) && count($imgs) == 1 )
    {
      $height = $imgs->item(0)->getAttribute('height');
      $width = $imgs->item(0)->getAttribute('width');

      if ( ! empty($height) )
        $style .= 'height:' . $height . 'px;';

      if ( ! empty($width) )
        $style .= 'width:' . $width . 'px;';
      
      // Update the style attribute of the TD element.
      $td->setAttribute('style', $style);
    }
  }

// Save the HTML document.
$doc->saveHTMLFile('/path/to/newfile.html');

    Updates:

    <html>
  <body>
    <table>
      <tr>
        <td><img src="test.png" height="100" width="100" /></td>
        <td>
          <p><img src="test2.png" height="100" /></p>
        </td>
      </tr>
    </table>
  </body>
</html>

    To:

    <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd">
<html>
  <body>
    <table>
      <tr>
        <td style="height:100px;width:100px;"><img src="test.png" height="100" width="100"></td>
        <td style="height:100px;">
          <p><img src="test2.png" height="100"></p>
        </td>
      </tr>
    </table>
  </body>
</html>
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