title: php inner classes support
body: <p>Does PHP versions 5.3 or after support inner classes?
  example:</p>
  
  <pre><code>class MyClass{
      class PrivateClass1{
  
      }
      class PrivateClass2{
  
      }
      class PrivateClass3{
  
      }
  
      private $obj1;
      private $obj2;
      private $obj3;
  
      __construct(){
          $obj1 = new PrivateClass1();
          $obj2 = new PrivateClass2();
          $obj3 = new PrivateClass3();
      }
  }
  </code></pre>