Symfony <5.1 PHP 7.4 property types support

Php74ReflectionExtractor.php

<?php

declare(strict_types=1);

namespace App\PropertyInfo;

use Symfony\Component\PropertyInfo\PropertyTypeExtractorInterface;
use Symfony\Component\PropertyInfo\Type;

final class Php74ReflectionExtractor implements PropertyTypeExtractorInterface
{
    public function getTypes(string $class, string $property, array $context = []): ?array
    {
        if (\PHP_VERSION_ID < 70400) {
            return null;
        }

        try {
            $reflectionProperty = new \ReflectionProperty($class, $property);
        } catch (\ReflectionException $e) {
            return null;
        }

        /** @var \ReflectionType|null $reflectionType */
        $reflectionType = $reflectionProperty->getType();

        if (null === $reflectionType) {
            return null;
        }

        $phpTypeOrClass = $reflectionType->getName();
        $nullable = $reflectionType->allowsNull();

        if (Type::BUILTIN_TYPE_ARRAY === $phpTypeOrClass) {
            if ($reflectionProperty->getDocComment()) {
                return null;
            }

            return [new Type(Type::BUILTIN_TYPE_ARRAY, $nullable, null, true)];
        }

        if ('void' === $phpTypeOrClass) {
            return [new Type(Type::BUILTIN_TYPE_NULL, $nullable)];
        }

        if ($reflectionType->isBuiltin()) {
            return [new Type($phpTypeOrClass, $nullable)];
        }

        $class = $this->resolveClass($phpTypeOrClass, $reflectionProperty->getDeclaringClass());

        return [new Type(Type::BUILTIN_TYPE_OBJECT, $nullable, $class)];
    }

    private function resolveClass(string $name, \ReflectionClass $declaringClass): string
    {
        if ('self' === $lcName = strtolower($name)) {
            return $declaringClass->name;
        }

        if ('parent' === $lcName && $parent = $declaringClass->getParentClass()) {
            return $parent->name;
        }

        return $name;
    }
}

property_info.yaml

services:
    HappyJob\PropertyInfo\Php74ReflectionExtractor:
        tags:
            - property_info.type_extractor