Hello, Space Explorer! Today, we're exploring an exciting and essential concept in PHP: managing data using classes. We will create a simple Student Management System using object-oriented programming. Our system will store students and their grades, showcasing how classes and methods can be effectively utilized in real-world applications. Ready to get started? Awesome, let's jump in!

We will be implementing a StudentManager class in PHP and using an array to manage our students and their respective grades. Let's begin by defining this class and outlining the methods we need.

The StudentManager class uses a private array $students to hold the student entries. We provide methods to manipulate and access this data.

The addStudent method checks if a student already exists in our array. If they do, their grade is updated; if not, the student is added to the array.