Question

http://codepad.viper-7.com/ezvlkQ

So, I’m trying to figure out:

...?php

$object = new A();

class A 
{
  static public $foo = 'bar';
  function displayFoo()
  {
    echo $this->$foo;
  }
}

A::displayFoo();
A->displayFoo();
?>

About this, how many errors can you find? Can you tell me what they are in real human terms? I can’t really interpret what is and what is not okay from the validator that codepad uses…

Answer 1

I’ve updated your code here http://codepad.viper-7.com/UaUE4g

Error 1:

echo $this->$foo;

This should read:

echo self::$foo;

.. as it is static.

Error 2:

A::displayFoo();

The method is an instance method :: is used for access to static methods.

Error 3:

A->displayFoo();

This is an error because A is undefined and if it was it should have read $A. This would be okay:

$object->displayFoo();

.. as $object is an instance of class A.

Next step, consult the manual on the topic static.