Zend\Code\Generator\ValueGenerator::isValidConstantType PHP Method

    public function isValidConstantType()
    {
        if ($this->type == self::TYPE_AUTO) {
            $type = $this->getAutoDeterminedType($this->value);
        } else {
            $type = $this->type;
        }
        $validConstantTypes = [self::TYPE_ARRAY, self::TYPE_ARRAY_LONG, self::TYPE_ARRAY_SHORT, self::TYPE_BOOLEAN, self::TYPE_BOOL, self::TYPE_NUMBER, self::TYPE_INTEGER, self::TYPE_INT, self::TYPE_FLOAT, self::TYPE_DOUBLE, self::TYPE_STRING, self::TYPE_CONSTANT, self::TYPE_NULL];
        return in_array($type, $validConstantTypes);
    }