SimpleXMLElement + null safe operator results in errors #6020
Description
Bug report
When using the null safe operator with SimpleXMLElement phpstan reports an error. More specifically, phpstan doesn't seem to understand that the properties of a SimpleXMLElement object can possibly return null.
Using nullsafe property access on non-nullable type SimpleXMLElement. Use -> instead.
Code snippet that reproduces the problem
https://phpstan.org/r/68f49c78-6d49-4e4c-96f0-83562eff662e
Here's some additional code illustrating the way properties on the SimpleXMLElement object work.
>>> $foo = new SimpleXMLElement('<foo>asdf</foo>')
=> SimpleXMLElement {#5830
+"0": "asdf",
}
>>> $foo
=> SimpleXMLElement {#5830
+"0": "asdf",
}
>>> $foo->bar
=> SimpleXMLElement {#5839}
>>> $foo->bar->baz
=> null
>>> $foo->bar->baz->qux
<warning>PHP Warning: Attempt to read property "qux" on null in eval()'d code on line 1</warning>
=> nullThis is a bit odd because $foo->bar (a non-existent element in the XML) returns an empty SimpleXMLElement. Perhaps I'm missunderstanding the way the SimpleXMLElement object works.
Expected output
No errors