How to use classes and constructors in PHP?

[radulescuiulia]

Hello!

I'm writing the following code, which doesn't print anything:

Code: Select all

class MyClass {
         private $id;
         public $string = "iiii";

         public function display () {
               echo $string;
            }
      }

   $b = new MyClass();
   $b->display();


When I replace echo $string with echo "ok", it prints "ok".
Where is the error?

[seandisanti]

$string does not exist in the scope of the function trying to display it. it must be referenced with $this->string