Simple HTML DOM getting all attributes from a tag

To grab all those attributes, you should before investigate the parsed element, like this:

foreach($html->find('div[class=bar] a') as $a){
  var_dump($a->attr);
}

...and see if those attributes exist. They don't seem to be valid HTML, so maybe the parser discards them.

If they exist, you can read them like this:

foreach($html->find('div[class=bar] a') as $a){
  $article = array($a->href, $a->innertext);
  if (isset($a->attr['data1'])) {
    $article['data1'] = $a->attr['data1'];
  }
  if (isset($a->attr['data2'])) {
    $article['data2'] = $a->attr['data2'];
  }
  //...
  $articles[] = $article;
}

To get both classes you can use a multiple selector, separated by a comma:

foreach($html->find('div[class=bar] a, div[class=bar2] a') as $a){
...

I know this question is old, but the OP asked how they could get all the attributes in one statement. I just did this for a project I'm working on.

You can get all the attributes for an element with the getAllAttributes() method. The results are automatically stored in an array property called attr.

In the example below I am grabbing all links but you can use this with whatever you want. NOTE: This also works with data- attributes. So if there is an attribute called data-url it will be accessible with $e->attr['data-url'] after you run the getAllAttributes method.

In your case the attributes your looking for will be $e->attr['data1'] and $e->attr['data2']. Hope this helps someone if not the OP.

Get all Attributes

$html = file_get_html('somefile.html');
foreach ($html->find('a') as $e) {   //used a tag here, but use whatever you want
    $e->getAllAttributes();

    //testing that it worked
    print_r($e->attr);
}

$data1 = $html->find('.bar > a', 0)->attr['data1'];
$data2 = $html->find('.bar > a', 0)->attr['data2'];