Assert\Assertion::__callStatic PHP Method

    public static function __callStatic($method, $args)
    {
        if (strpos($method, "nullOr") === 0) {
            if (!array_key_exists(0, $args)) {
                throw new BadMethodCallException("Missing the first argument.");
            }
            if ($args[0] === null) {
                return true;
            }
            $method = substr($method, 6);
            return call_user_func_array(array(get_called_class(), $method), $args);
        }
        if (strpos($method, "all") === 0) {
            if (!array_key_exists(0, $args)) {
                throw new BadMethodCallException("Missing the first argument.");
            }
            static::isTraversable($args[0]);
            $method = substr($method, 3);
            $values = array_shift($args);
            $calledClass = get_called_class();
            foreach ($values as $value) {
                call_user_func_array(array($calledClass, $method), array_merge(array($value), $args));
            }
            return true;
        }
        throw new BadMethodCallException("No assertion Assertion#" . $method . " exists.");
    }