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Bug #81593 ReflectionUnionType does not honor order of type
Submitted: 2021-11-05 22:37 UTC Modified: 2021-11-05 22:44 UTC
From: php at vxvr dot de Assigned:
Status: Not a bug Package: Reflection related
PHP Version: 8.1.0RC5 OS: unix / debian
Private report: No CVE-ID: None
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 [2021-11-05 22:37 UTC] php at vxvr dot de
Using the latest PHP version 8.1 RC 5

I would expect the ParameterUnionType to return the ReflectionNamedTypes in order in which they are defined at the method, but as it seems they are returned in a fixed order.

Test script:

class MyClass {
    public function __construct(int|string $value)

$reflectionMethod = new ReflectionMethod(MyClass::class, '__construct');
$parameterUnionType = $reflectionMethod->getParameters()[0]->getType();
$types = array_map(fn(ReflectionNamedType $type) => $type->getName(), $parameterUnionType->getTypes());
// Expected: ['int', 'string']
// Actual: ['string', 'int']

Expected result:
// Expected: ['int', 'string']

Actual result:
// Actual: ['string', 'int']


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 [2021-11-05 22:44 UTC]
-Status: Open +Status: Not a bug
 [2021-11-05 22:44 UTC]
Working as intended and specified in

> The getTypes() method returns an array of ReflectionTypes that are part of the union. The types may be returned in an arbitrary order that does not match the original type declaration. The types may also be subject to equivalence transformations.
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