Creation of dynamic property is deprecated for PHP 8.2 for class ObjectPropertyHydrator

[BPaasch]

Bug Report

Q	A
Version(s)	4.13.0
PHP Version	8.2.4

Summary

When attempting to hydrate an object that only has a few properties available compared to the data coming in, PHP 8.2 throws this deprecation error:
Deprecated: Creation of dynamic property Paasch\Security\Security\Entity\Auth::$error is deprecated in /app/vendor/laminas/laminas-hydrator/src/ObjectPropertyHydrator.php on line 83

Current behavior

When hydrating an object, if the object doesn't have the properties for all of the data coming in and it doesn't have the __set magic method, it ends up throwing the deprecation error.

How to reproduce

1. Create a class that only has a single public property, $prop
2. Create an instance of the previous class, $myClassInst
3. Create an local variable that is an array of ['prop'=> 'value1', 'another' => 'value2'] as $ar
4. Create an instance of the ObjectPropertyHydrator class. $myHydrator
5. Try to hydrate it with $myHydrator: $myHydrator->hydrate($ar, $myClassInst);

A deprecation error is thrown:
Creation of dynamic property MyClass::$another is deprecated in /app/vendor/laminas/laminas-hydrator/src/ObjectPropertyHydrator.php on line 83

Expected behavior

I would expect that if the property that it is trying to hydrate doesn't exist and there is no __set magic method on the class hierarchy, then it should skip hydrating that property.

[froschdesign]

@BPaasch

I would expect that if the property that it is trying to hydrate doesn't exist and there is no __set magic method on the class hierarchy, then it should skip hydrating that property.

This means a BC break, because this library still supports version 8.0 and 8.1 and these versions allow the dynamic creation of properties:

If trying to assign to a non-existent property on an object, PHP will automatically create a corresponding property.

https://www.php.net/manual/language.oop5.properties.php#language.oop5.properties.dynamic-properties

And with version 8.2 of PHP this also works via the AllowDynamicProperties attribute:

This attribute is used to mark classes that allow dynamic properties.

https://www.php.net/manual/class.allowdynamicproperties.php

---

An optional parameter for the configuration of the hydrator could maybe help here.

[BPaasch]

An optional parameter sounds like a good idea that defaults to the current way it works.

[froschdesign]

@BPaasch
Would you be willing to make a suggestion via a request pull?

[BPaasch]

I will try and work on that.