Dynamically replace the “src” attributes of all

Answer 1

The link you posted has the answer:

// Create DOM from string
$html = str_get_html('
Hello
World
');

$html->find('div', 1)->class = 'bar';

$html->find('div[id=hello]', 0)->innertext = 'foo';

echo $html; // Output: 
foo
World

Of course, you will need to modify the tag/attribute/value names to meet your specific needs.