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Editorial Team
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Asked: 2026-05-16T22:09:51+00:00

I have this function to ensure every img tag has absolute URL: function absoluteSrc($html,

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I have this function to ensure every img tag has absolute URL:

function absoluteSrc($html, $encoding = 'utf-8')
{
    $dom = new DOMDocument();
    // Workaround to use proper encoding
    $prehtml  = "<html><head><meta http-equiv=\"Content-Type\" content=\"text/html; charset={$encoding}\"></head><body>";
    $posthtml = "</body></html>";

    if($dom->loadHTML( $prehtml . trim($html) . $posthtml)){
        foreach($dom->getElementsByTagName('img') as $img){
            if($img instanceof DOMElement){
                $src = $img->getAttribute('src');
                if( strpos($src, 'http://') !== 0 ){
                    $img->setAttribute('src', 'http://my.server/' . $src);
                }
            }
        }

        $html = $dom->saveHTML();

        // Remove remains of workaround / DomDocument additions
        $cut_start  = strpos($html, '<body>') + 6;
        $cut_length = -1 * (1+strlen($posthtml));
        $html = substr($html, $cut_start, $cut_length);
    }
    return $html;
}

It works fine, but it returns decoded entities as unicode characters

$html = <<< EOHTML
<p><img src="images/lorem.jpg" alt="lorem" align="left">
Lorem ipsum dolor sit amet consectetuer Nullam felis laoreet
Cum magna. Suscipit sed vel tincidunt urna.<br>
Vel consequat pretium Curabitur faucibus justo adipiscing elit.
<img src="others/ipsum.png" alt="ipsum" align="right"></p>

<center>&copy; Dr&nbsp;Jekyll &#38; Mr&nbsp;Hyde</center>
EOHTML;

echo absoluteSrc($html);

Outputs: 

<p><img src="http://my.server/images/lorem.jpg" alt="lorem" align="left">
Lorem ipsum dolor sit amet consectetuer Nullam felis laoreet
Cum magna. Suscipit sed vel tincidunt urna.<br>
Vel consequat pretium Curabitur faucibus justo adipiscing elit.
<img src="http://my.server/others/ipsum.png" alt="ipsum" align="right"></p>

<center>© Dr Jekyll &amp; Mr Hyde</center>

As you can see in the last line

  • &copy; is translated to © (U+00A9),
  • &nbsp; to non-breaking space (U+00A0),
  • &#38; to &amp;

I would like them to remain the same as in input string.

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1 Answer

  1. Editorial Team

    I’d like to know the answer to this as well.

    I ended up converting &..; entities to **ENTITY-...-ENTITY** before parsing and converting back after it is done.

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