Wordpress - Replace image attributes for lazyload plugin (data-src)

instead of replacing the alt tag you could add-an-attribute-to-a-tag

function add_lazyload($content) {
     $dom = new DOMDocument();
     @$dom->loadHTML($content);


     foreach ($dom->getElementsByTagName('img') as $node) {  
         $oldsrc = $node->getAttribute('src');
         $node->setAttribute("data-original", $oldsrc );
         $newsrc = ''.get_template_directory_uri().'/library/images/nothing.gif';
         $node->setAttribute("src", $newsrc);
     }
     $newHtml = $dom->saveHtml();
     return $newHtml;
}

note: i didn't quite tested this code, so be careful :)


I modified peteroak's excellent solution to convert to utf-8 and stripped the doctype, html, and body from the ouput.

function add_lazyload($content) {

    $content = mb_convert_encoding($content, 'HTML-ENTITIES', "UTF-8");
    $dom = new DOMDocument();
    @$dom->loadHTML($content);

    foreach ($dom->getElementsByTagName('img') as $node) {  
        $oldsrc = $node->getAttribute('src');
        $node->setAttribute("data-original", $oldsrc );
        $newsrc = ''.get_template_directory_uri().'/images/nothing.gif';
        $node->setAttribute("src", $newsrc);
    }
    $newHtml = preg_replace('/^<!DOCTYPE.+?>/', '', str_replace( array('<html>', '</html>', '<body>', '</body>'), array('', '', '', ''), $dom->saveHTML()));
    return $newHtml;
}
add_filter('the_content', 'add_lazyload');

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