title: empty() behavior
body: <p>Maybe I'm asking a stupid question, but I can't understand this behavior:</p>
  
  <pre><code>&lt;?php
      $this-&gt;meeting-&gt;google_id = 'test';
      $test = $this-&gt;meeting-&gt;google_id;
      var_dump(empty($test));
      var_dump(empty($this-&gt;meeting));
      var_dump(empty($this-&gt;meeting-&gt;google_id));
  ?&gt;
  </code></pre>
  
  <p>gives output:</p>
  
  <pre><code>bool(false) bool(false) bool(true) 
  </code></pre>
  
  <p>Why the result of <code>empty($this-&gt;meeting-&gt;google_id);</code> is true? And how should I check this property then?</p>