Tester\Assert::isEqual PHP Method

    private static function isEqual($expected, $actual, $level = 0, $objects = NULL)
    {
        if ($level > 10) {
            throw new \Exception('Nesting level too deep or recursive dependency.');
        }
        if (is_float($expected) && is_float($actual) && is_finite($expected) && is_finite($actual)) {
            $diff = abs($expected - $actual);
            return $diff < self::EPSILON || $diff / max(abs($expected), abs($actual)) < self::EPSILON;
        }
        if (is_object($expected) && is_object($actual) && get_class($expected) === get_class($actual)) {
            $objects = $objects ? clone $objects : new \SplObjectStorage();
            if (isset($objects[$expected])) {
                return $objects[$expected] === $actual;
            } elseif ($expected === $actual) {
                return TRUE;
            }
            $objects[$expected] = $actual;
            $objects[$actual] = $expected;
            $expected = (array) $expected;
            $actual = (array) $actual;
        }
        if (is_array($expected) && is_array($actual)) {
            ksort($expected, SORT_STRING);
            ksort($actual, SORT_STRING);
            if (array_keys($expected) !== array_keys($actual)) {
                return FALSE;
            }
            foreach ($expected as $value) {
                if (!self::isEqual($value, current($actual), $level + 1, $objects)) {
                    return FALSE;
                }
                next($actual);
            }
            return TRUE;
        }
        return $expected === $actual;
    }