<?php

class A {
    const TEST = "foo";

    public static $variable;

    public static $variable2;

    public static function setVar1($v)
    {
        static::setVariable($v);
    }

    public static function setVar2($v)
    {
        self::setVariable($v);
    }

    protected static function setVariable($v)
    {
        self::$variable = $v;
    }

    public static function getConstant1()
    {
        return static::TEST;
    }

    public static function getConstant2()
    {
        return self::TEST;
    }
}

class B extends A
{
    const TEST = "bar";

    protected static function setVariable($v)
    {
        self::$variable2 = $v;
    }
}

// ----
echo "A\n";
echo "getConstant1: ".A::getConstant1() . "\n";
echo "getConstant2: ".A::getConstant2() . "\n";
A::setVar1("foo");
echo "setVar1(foo): variable: '".A::$variable . "', variable2: '".A::$variable2 . "'\n";
A::setVar2("bar");
echo "setVar2(bar): variable: '".A::$variable . "', variable2: '".A::$variable2 . "'\n";

echo "\nB\n";
echo "getConstant1: ".B::getConstant1() . "\n";
echo "getConstant2: ".B::getConstant2() . "\n";
B::setVar1("foo");
echo "setVar1(foo): variable: '".B::$variable . "', variable2: '".B::$variable2 . "'\n";
B::setVar2("bar");
echo "setVar2(bar): variable: '".B::$variable . "', variable2: '".B::$variable2 . "'\n";