think\console\Input::parseShortOption PHP Method

    private function parseShortOption($token)
    {
        $name = substr($token, 1);
        if (strlen($name) > 1) {
            if ($this->definition->hasShortcut($name[0]) && $this->definition->getOptionForShortcut($name[0])->acceptValue()) {
                $this->addShortOption($name[0], substr($name, 1));
            } else {
                $this->parseShortOptionSet($name);
            }
        } else {
            $this->addShortOption($name, null);
        }
    }