Add PHP 8.1 Intersection Types Support for function Parameters

[karyna-t]

In PHP 8.1, new Intersection types feature was introduced. (see details https://wiki.php.net/rfc/pure-intersection-types)

e.g. it's possible to create a function with a signature like function baz(Foo&Bar $arg) { ...

Right now Magento will not work properly with such a feature. There are several places where we're using Parameter's Class (e.g. for code generation):

• https://github.com/magento/magento2/blob/platform-health/lib/internal/Magento/Framework/Code/Generator/EntityAbstract.php#L338
• https://github.com/magento/magento2/blob/platform-health/lib/internal/Magento/Framework/Code/Reader/ArgumentsReader.php#L105
• https://github.com/magento/magento2/blob/platform-health/lib/internal/Magento/Framework/Code/Reader/ClassReader.php#L40
• https://github.com/magento/magento2/blob/platform-health/lib/internal/Magento/Framework/Code/Reader/SourceArgumentsReader.php#L69
• https://github.com/magento/magento2/blob/platform-health/lib/internal/Magento/Framework/Interception/Code/InterfaceValidator.php#L175
• https://github.com/magento/magento2/blob/platform-health/lib/internal/Magento/Framework/TestFramework/Unit/Helper/ObjectManager.php (better to re-check in case of other places I missed)

These places should be adjusted to work properly with intersection types. The main reason for this adjustments it's because 3rd-party developers may develop some new extensions and declare them to support only php >= 8.1. in such modules they may use this PHP8.1-feature.

Expected result (*)

Magento should not break when Intersection types are used in the function parameters. It should properly generate code and so on.

Actual result (*)

Right now Magento can't handle Intersection types introduced in php 8.1

Related issues:

https://github.com/magento/magento2/issues/34932 https://github.com/magento/magento2/issues/34933

Note: There is a Union type feature that should also be implemented. Need to make sure that 2 people do not work on these features in parallel, as this will lead to a conflict! https://github.com/magento/magento2/issues/34263

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[engcom-November]

Hi @karyna-tsymbal-atwix , Thank you for reporting and collaboration. We have gone through the main description and found that this is not related to any bug of Magento but it can be a good feature to have in Magento. Hence marking this ticket as a feature request to process further. Thank you.