PHP Strict Standards: Declaration of should be compatible

Question

I have the following hierarchy of classes:

class O_Base {...}

class O extends O_Base {...}

abstract class A_Abstract {
    public function save(O_Base $obj) {         


        

Answer 1

I had similar problem.

For me the explanation is much simpler, without cool theories: in PHP the above code is making method overriding. But the idea of such code in my case was method overloading which is not possible in PHP in this way.

So, to create required logic (required by your application) you need to use workarounds in order to make compatible method signatures (by inheriting parameters types or making some parameters optional).