title: What PHP version supports this kind of assigning?
body: <p>What PHP versions supports this:</p>
  
  <pre><code>function mytest($mVar = null) {    
      ($mVar === null) and ($mVar = "Hello"); // &lt;--- This line
      echo $mVar;
  }
  </code></pre>
  
  <p>Does it work in PHP versions lower than 5.3.x ?</p>