title: Undefined Variable PHP_SELF
body: <p>I am developing a backend with php here.</p>
  
  <p>I am having problem with such error like this:</p>
  
  <blockquote>
    <p>Undefined variable : PHP_SELF</p>
  </blockquote>
  
  <p>on my htdocs directory.</p>
  
  <p>I'm developing with php 5.4.4 , and if you want to look at the source code here it is: </p>
  
  <p><a href="http://pastebin.com/xr2PxbNG" rel="noreferrer">http://pastebin.com/xr2PxbNG</a></p>