PHP memoization test using static function var

PHP memoization test #1

<?php

class Broom
{
    public function rememberMe()
    {
        static $outcome;
        if ($outcome) return $outcome;
        return $outcome = rand();
    }
}

class Sponge extends \Broom
{
}

$a = new \Broom;
var_dump($a->rememberMe(), $a->rememberMe(), $a->rememberMe());
$b = new \Broom;
$c = new \Sponge;
var_dump((new \Broom)->rememberMe());
var_dump($b->rememberMe(), $b->rememberMe());
var_dump($c->rememberMe(), $c->rememberMe());
var_dump((new \Broom)->rememberMe());