Vanilla\Addon::testRequirement PHP Method

    private static function testRequirement($version, $req)
    {
        if (isset($req[0])) {
            // This is a boolean group.
            $logic = $req[0];
            foreach ($req[1] as $part) {
                $valid = self::testRequirement($version, $part);
                if ($valid && $logic === 'or') {
                    return true;
                } elseif (!$valid && $logic === 'and') {
                    return false;
                }
            }
            return $logic === 'or' ? false : true;
        } else {
            // This is an individual requirement.
            $req += ['op' => '==', 'v' => '0.0', 'logic' => ',', 'v2' => '999999'];
            $op = $req['op'];
            if ($op === '-') {
                $valid = version_compare($version, $req['v'], '>=') && version_compare($version, $req['v2'], '<=');
            } else {
                $valid = version_compare($version, $req['v'], $op);
            }
            return $valid;
        }
    }