[PHP] Accessing undeclared/inaccessible static property must produce error

### Apache NetBeans version

Apache NetBeans 18

### What happened

Accessing undeclared static property must produce error.
Error type: runtime error.

### How to reproduce

```php
fnInstance();
myFunc($ins);
MyClass2::fnStatic();
(new MyClass2)->fnInstance();
```

### Did this work correctly in an earlier version?

No / Don't know

### Operating System

Windows 10

### JDK

Java: 14.0.1; Java HotSpot(TM) 64-Bit Server VM 14.0.1+7 Runtime: Java(TM) SE Runtime Environment 14.0.1+7

### Apache NetBeans packaging

Apache NetBeans binary zip

### Anything else

_No response_

### Are you willing to submit a pull request?

No

Start by running the supplied PHP reproduction in NetBeans 18 and locating the PHP analysis or diagnostic entry point for static-property access. Compare declared, inaccessible, and undeclared cases across static, self, and instance forms; done means each marked “must display error” produces an error while the marked OK cases remain valid.

Written by the indexing model from the issue text.