Declaring php class member variables
<p>I was trying to write a class in such simple way</p>

<pre><code>class piklu
{
   private $x=5;
   public function display()
   {
      echo $this-&gt;$x;
   }
}
</code></pre>

<p>but when after creating object of this class I'm calling the function display it is displaying an error unkown variable $x. Can any body suggest me what exactly I have to do to declare a private member variable in php.</p>
