Zend\Code\Generator\ParameterGenerator::setType PHP Method

    public function setType($type)
    {
        $this->type = TypeGenerator::fromTypeString($type);
        return $this;
    }

    /**
     * @param  ParameterReflection $reflectionParameter
     * @return ParameterGenerator
     */
    public static function fromReflection(ParameterReflection $reflectionParameter)
    {
        $param = new ParameterGenerator();
        $param->setName($reflectionParameter->getName());

        if ($reflectionParameter->isArray()) {
            $param->setType('array');
        } elseif (method_exists($reflectionParameter, 'isCallable') && $reflectionParameter->isCallable()) {
            $param->setType('callable');
        } else {
            $typeClass = $reflectionParameter->getClass();
            if ($typeClass) {
                $param->setType($typeClass->getName());
            }
        }

        $param->setPosition($reflectionParameter->getPosition());

        if ($reflectionParameter->isOptional()) {
            $param->setDefaultValue($reflectionParameter->getDefaultValue());
        }
        $param->setPassedByReference($reflectionParameter->isPassedByReference());

        return $param;
    }