Cannot override abstract classes in PHP

[florianschieder]

Example:

• Declare a PHP class with an abstract method at Rust level
• Extend this class at PHP level to override the abstract method

Trying to construct an object which derives the abstract class results in a panic here. The current implementation seems like it only tries to lookup the state constructor from the current Zend class entry. I assume subclassing an abstract class exposed by Rust should either set the state constructor for derived classes properly or the current implementation of create_object() should scan the entire inheritance tree until it finds the proper state constructor.

Please let me know if you need further information to reproduce the issue. Thank you in advance!

[jmjoy]

You are right, I can reproduce this issue.

The reason is subclass will rewrite the create_object to parent's.

https://github.com/php/php-src/blob/171e3986b044875ca252ef59dbb4d1b68a7e3d6c/Zend/zend_inheritance.c#L137

I will fix this problem later, or if you are interested, you can also submit a PR.