PHP 'non-object' error

I'm working on a small MVC framework in PHP for an exercise. PHP,
however, doesn't seem to like my Controller class. The class contains an instance of a
loader that loads views:

abstract
            class Controller
{
 public $load;
 function
            __construct($load) 
 {
 $this->load =
            $load;

 }
 abstract public function
            index();
}

From
there, I can override Controller for all my controllers. For instace, my index
controller:

class Index extends
            Controller
{
 public function index()


            {
 $this->load->view("hello_world");

            }
}

But when
I create it:

require
            'Controller.php';
require 'Load.php'

require
            'controllers/Index.php';
$i = new Index(new
            Load());
$i->index();

I
get this error:

PHP Fatal error:
            Call to a member function view() on a non-object in /var/www/controllers/Index.php on
            line 7

Can
you guys help me out? I know I set the load in the constructor, and
the load class does have a method called view, so why is it giving
me this error?
Also: Load class, just for good
measure

class
            Load
{
 public function view($filename, $data = null)

            {
 if(is_array($data)) extract($data);
 include
            ROOT.DS.'views'.DS.$filename.'.php';

            }

}

Answer

The problem is with this code, and it's not
always obvious:

class Index
            extends Controller
 ^^^^^
{
 public function
            index()
 ^^^^^

 {

            $this->load->view("hello_world");

            }
}

This is
the same name and therefore a PHP 4 backwards compatible constructor. The parent's
constructor then is not called, $load not set and the function
not defined.

Knowing this, there are many
solutions,
including:

namespace
            DelishusCake;

Introduce
a Namespace

This automatically fixes
your issue. You need to place this on top of the
file.

class Index extends
            Controller
{
 public function index($load =
            NULL)

 {
 isset($load) && $this->load =
            $load;
 $this->load->view("hello_world");

            }
}

Make
the PHP4 backwards compatible constructor
work

Or:

class
            MyIndex extends Controller
{
 public function index()
 {
            
 $this->load->view("hello_world");

            }
}

Rename
the
class

Or:

class
            Index extends Controller
{
 public function __construct($load)
            {
 parent::__construct($load);
 }
 public function
            index()

 { 

            $this->load->view("hello_world");

            }
}

Add
a PHP 5 constructor, call the parent's
constructor

Keep in mind that you
only need this because it's the same name. The in depth description you can find as well
in the PHP Manual on
the Constructors and Destructors
page.