title: simple html dom: how get a tag without certain attribute
body: <p>I want to get the tags with "class" attribute equal to "someclass" but only those tags that hasn't defined the attribute "id".</p>
  
  <p><strong>I tried</strong> the following (based on this answer) but didn't work:</p>
  
  <pre><code>$html-&gt;find('.someclass[id!=*]');
  </code></pre>
  
  <p><strong>Note:</strong></p>
  
  <p>I'm using <a href="http://simplehtmldom.sourceforge.net/manual.htm" rel="nofollow">Simple HTML DOM class</a> and in the basic documentation that they give, I didn't find what I need.</p>