title: In PHP What would be the output of print 4 << 5 operations?
body: <p>I had a question in one interview, and still now I didn't get it's answer,
  What would be the output of <code>print 4 &lt;&lt; 5</code> operations in <code>PHP</code> ?</p>
  
  <p>It's answer 128 I know, but how it is, please explain me</p>