title: instanceof negation
body: <p>Which is the correct format for negating instanceof?</p>
  
  <pre><code>if ( ! $a instanceof stdClass)
  </code></pre>
  
  <p>or</p>
  
  <pre><code>if ( ! ($a instanceof stdClass) ) 
  </code></pre>
  
  <p>I've convinced myself the latter is correct way, probably after reading a blog article several years ago, but after some command-line tests, they both seem equivalent. <em>Are</em> they?</p>