Basic OOP problem

[Gessle]

I am trying to learn object-oriented programming, but here I am. I can't get basic things working.
How do I put "object array" inside another class/object?

Here is code:

class Block
    {
    private $landscapeName, $landscapeColor, $landscapeImage;
    private $buildingName, $buildingImage;
    public function __construct($db=NULL, $x=0, $y=0)
        {
        }
    public function getLandscapeImage()
        {
        return "bgGrass.png";
        }
   }

class Map
    {
    private $block;
    public function __construct($db=NULL)
        {
        for ($i=0;$i<3;$i++)
            for ($j=0;$j<3;$j++)
                $block[$i][$j] = new Block($db, $i, $j);
        //This works
        print $block[0][0]->getLandscapeImage();
        }
    public function build($db, $x, $y)
        {
        $block[$x][$y]->build();
        }
    public function giveArea($x = 0, $y = 0)
        {
        //This works not
        $block[0][0]->getLandscapeImage();
	}
    }

$wholeMap = new Map();
$wholeMap->giveArea();

When $wholeMap->giveArea(); is called it gives "Fatal error: Call to a member function getLandscapeImage() on a non-object".

What am I doing wrong? :/

[Drakla]

All your $blocks apart from the declaration should be $this->block

[Gessle]

How stupid I can be 😃

Thank you very much!