Please i need explanatio of this arrow ( -> ) in php

Question

the explanation

Answer 1

Just like in this Code:
Learn OOP PHP here: https://www.sololearn.com/learn/984/?ref=app
It is used to access methods of objects.
https://code.sololearn.com/w1gNBXXhV61D/?ref=app

Answer 2

calling a function from a class