What is the difference between "GET" and "POST" methods in PHP$?$ When would you use each?

How can you prevent SQL injection attacks in PHP$?$

Explain the concept of object$-$oriented programming $($OOP$)$ in PHP$.$

What is the purpose of the "try$-$catch" block in PHP$?$ Give an example.

What are namespaces in PHP$?$ Why are they useful?