title: If statement that has in condition only a variable
body: <p>Okay, just a simple question..</p>
  
  <p>I am never sure about what it is... can somebody please explain what means</p>
  
  <pre><code>if($var) { ... }
  </code></pre>
  
  <p>What are we actually examining here ?!</p>
  
  <p>And yes, another case also :</p>
  
  <pre><code>if (!$var) { ... }
  </code></pre>
  
  <p>Tnx! :)</p>