How to refer to a static constant member variable in PHP

Question

I have a class with member variables. What is the syntax in PHP to access the member variables from within the class when the class is being called from a static contex

Answer 1

For brevity sake I will only offer the php 5 version:

class Example
{
    // Class Constant
    const APPLE = 'red';

    // Private static member
    private static $apple;

    public function __construct()
    {
        print self::APPLE . "\n";
        self::$apple = 'red';
    }
}