title: PHP_INT_SIZE returns 4 But my Operating System Is 64 bit
body: <p>My operating System is windows 7 and 64bit.<br>
  Now I run following code:</p>
  
  <pre><code>echo PHP_INT_SIZE;//prints 4
  echo PHP_INT_MAX;//prints 2147483647
  </code></pre>
  
  <p>But I think it should be <code>8</code> and <code>(2^63-1)//^ represents power</code></p>
  
  <p>Can anyone explain me why this happen?</p>