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isBuiltin example

$signature_line .= 'public function ' . $reference . $function_name . '(';
    }

    $signature_line .= implode(', ', $parameters);
    $signature_line .= ')';
    if ($reflection_method->hasReturnType()) {
      $signature_line .= ': ';
      $return_type = $reflection_method->getReturnType();
      if ($return_type->allowsNull()) {
        $signature_line .= '?';
      }
      if (!$return_type->isBuiltin()) {
        // The parameter is a class or interface.         $signature_line .= '\\';
      }
      $return_type_name = $return_type->getName();
      if ($return_type_name === 'self') {
        $return_type_name = $reflection_method->getDeclaringClass()->getName();
      }
      $signature_line .= $return_type_name;
    }

    $output = $signature_line . "\n{\n";

return;
        }

        if ('false' === $type) {
            if (false === $value) {
                return;
            }
        } elseif ('true' === $type) {
            if (true === $value) {
                return;
            }
        } elseif ($reflectionType->isBuiltin()) {
            $checkFunction = sprintf('is_%s', $type);
            if ($checkFunction($value)) {
                return;
            }
        }

        throw new InvalidParameterTypeException($this->currentId, \is_object($value) ? $class : get_debug_type($value), $parameter);
    }

    private function getExpressionLanguage(): ExpressionLanguage
    {

/** * Gets the parameter's class name. * * @param \ReflectionParameter $parameter * The parameter. * * @return string|null * The parameter's class name or NULL if the parameter is not a class. */
  public static function getParameterClassName(\ReflectionParameter $parameter) : ?string {
    $name = NULL;
    if ($parameter->hasType() && !$parameter->getType()->isBuiltin()) {
      $name = $parameter->getType()->getName();
      $lc_name = strtolower($name);
      switch ($lc_name) {
        case 'self':
          return $parameter->getDeclaringClass()->getName();

        case 'parent':
          return ($parent = $parameter->getDeclaringClass()->getParentClass()) ? $parent->name : NULL;
      }
    }
    return $name;
  }

$prefix .= sprintf('[%s]', $this->prototypeIndex);
            }

            $options = array_map(static fn (string $option): string => sprintf('%s[%s]', $prefix, $option), $options);
        }

        return implode('", "', $options);
    }

    private function getParameterClassName(\ReflectionParameter $parameter): ?string
    {
        if (!($type = $parameter->getType()) instanceof \ReflectionNamedType || $type->isBuiltin()) {
            return null;
        }

        return $type->getName();
    }
}

/** * @return array */
    public static function castType(\ReflectionType $c, array $a, Stub $stub, bool $isNested)
    {
        $prefix = Caster::PREFIX_VIRTUAL;

        if ($c instanceof \ReflectionNamedType) {
            $a += [
                $prefix.'name' => $c instanceof \ReflectionNamedType ? $c->getName() : (string) $c,
                $prefix.'allowsNull' => $c->allowsNull(),
                $prefix.'isBuiltin' => $c->isBuiltin(),
            ];
        } elseif ($c instanceof \ReflectionUnionType || $c instanceof \ReflectionIntersectionType) {
            $a[$prefix.'allowsNull'] = $c->allowsNull();
            self::addMap($a, $c, [
                'types' => 'getTypes',
            ]);
        } else {
            $a[$prefix.'allowsNull'] = $c->allowsNull();
        }

        return $a;
    }

    }

    private function getEventFromTypeDeclaration(ContainerBuilder $container, string $id, string $method): string
    {
        if (
            null === ($class = $container->getDefinition($id)->getClass())
            || !($r = $container->getReflectionClass($class, false))
            || !$r->hasMethod($method)
            || 1 > ($m = $r->getMethod($method))->getNumberOfParameters()
            || !($type = $m->getParameters()[0]->getType()) instanceof \ReflectionNamedType
            || $type->isBuiltin()
            || Event::class === ($name = $type->getName())
        ) {
            throw new InvalidArgumentException(sprintf('Service "%s" must define the "event" attribute on "kernel.event_listener" tags.', $id));
        }

        return $name;
    }
}

/** * @internal */

->setPublic(true)
                ;
            }

            $kernelDefinition = $container->getDefinition('kernel');
            $kernelDefinition->addTag('routing.route_loader');

            $container->addObjectResource($this);
            $container->fileExists($this->getBundlesPath());

            $configureContainer = new \ReflectionMethod($this, 'configureContainer');
            $configuratorClass = $configureContainer->getNumberOfParameters() > 0 && ($type = $configureContainer->getParameters()[0]->getType()) instanceof \ReflectionNamedType && !$type->isBuiltin() ? $type->getName() : null;

            if ($configuratorClass && !is_a(ContainerConfigurator::class, $configuratorClass, true)) {
                $configureContainer->getClosure($this)($container, $loader);

                return;
            }

            $file = (new \ReflectionObject($this))->getFileName();
            /* @var ContainerPhpFileLoader $kernelLoader */
            $kernelLoader = $loader->getResolver()->resolve($file);
            $kernelLoader->setCurrentDir(\dirname($file));

        foreach ($reflectionTypes as $type) {
            if ($type instanceof \ReflectionIntersectionType) {
                if ('' !== $name = '('.self::exportType($owner, $noBuiltin, $type).')') {
                    $types[] = $name;
                }
                continue;
            }
            $name = $type->getName();

            if ($noBuiltin && $type->isBuiltin()) {
                continue;
            }
            if (\in_array($name, ['parent', 'self'], true) && $class ??= $owner->getDeclaringClass()) {
                $name = 'parent' === $name ? ($class->getParentClass() ?: null)?->name ?? 'parent' : $class->name;
            }

            $types[] = ($noBuiltin || $type->isBuiltin() || 'static' === $name ? '' : '\\').$name;
        }

        if (!$types) {
            return '';
        }

            $phpTypeOrClass = $type->getName();
            if ('null' === $phpTypeOrClass || 'mixed' === $phpTypeOrClass || 'never' === $phpTypeOrClass) {
                continue;
            }

            if (Type::BUILTIN_TYPE_ARRAY === $phpTypeOrClass) {
                $types[] = new Type(Type::BUILTIN_TYPE_ARRAY, $nullable, null, true);
            } elseif ('void' === $phpTypeOrClass) {
                $types[] = new Type(Type::BUILTIN_TYPE_NULL, $nullable);
            } elseif ($type->isBuiltin()) {
                $types[] = new Type($phpTypeOrClass, $nullable);
            } else {
                $types[] = new Type(Type::BUILTIN_TYPE_OBJECT, $nullable, $this->resolveTypeName($phpTypeOrClass, $declaringClass));
            }
        }

        return $types;
    }

    private function resolveTypeName(string $name, \ReflectionClass $declaringClass): string
    {

unset($context['has_constructor']);

        return new $class();
    }

    /** * @internal */
    protected function denormalizeParameter(\ReflectionClass $class, \ReflectionParameter $parameter, string $parameterName, mixed $parameterData, array $context, string $format = null): mixed
    {
        try {
            if (($parameterType = $parameter->getType()) instanceof \ReflectionNamedType && !$parameterType->isBuiltin()) {
                $parameterClass = $parameterType->getName();
                new \ReflectionClass($parameterClass); // throws a \ReflectionException if the class doesn't exist
                if (!$this->serializer instanceof DenormalizerInterface) {
                    throw new LogicException(sprintf('Cannot create an instance of "%s" from serialized data because the serializer inject in "%s" is not a denormalizer.', $parameterClass, static::class));
                }

                $parameterData = $this->serializer->denormalize($parameterData, $parameterClass, $format, $this->createChildContext($context, $parameterName, $format));
            }
        } catch (\ReflectionException $e) {
            throw new RuntimeException(sprintf('Could not determine the class of the parameter "%s".', $parameterName), 0, $e);
        }

// ignore missing classes         }
    }

    private static function preloadType(?\ReflectionType $t, array &$preloaded): void
    {
        if (!$t) {
            return;
        }

        foreach (($t instanceof \ReflectionUnionType || $t instanceof \ReflectionIntersectionType) ? $t->getTypes() : [$t] as $t) {
            if (!$t->isBuiltin()) {
                self::doPreload($t instanceof \ReflectionNamedType ? $t->getName() : $t, $preloaded);
            }
        }
    }
}

if ($type instanceof \ReflectionIntersectionType) {
                $typeHint = self::getTypeHintForType($type, $r, $noBuiltin);
                if (null === $typeHint) {
                    return null;
                }

                $types[] = sprintf('(%s)', $typeHint);

                continue;
            }

            if ($type->isBuiltin()) {
                if (!$noBuiltin) {
                    $types[] = $type->getName();
                }
                continue;
            }

            $lcName = strtolower($type->getName());
            $prefix = $noBuiltin ? '' : '\\';

            if ('self' !== $lcName && 'parent' !== $lcName) {
                $types[] = $prefix.$type->getName();