Learn PHP basics with hands-on practice in hello world in PHP, variables in PHP, functions in PHP, arrays in PHP, PHP inheritance, PHP exceptions, and more.

This interactive course introduces you to the fundamentals of PHP programming, one of the most widely used languages in web development. Starting with a simple hello world in PHP, you’ll explore the basics, including PHP output, variables in PHP, and PHP data types. You’ll also learn about PHP constants, arithmetic operators, comparison operators, logical operators, and assignment operators.

The course progresses into conditional statements in PHP, PHP switch, and various loops such as PHP for loop, PHP while loop, and more. You will then dive deeper into functions in PHP, understand PHP variable scope, and learn PHP pass by reference or value. Additionally, you’ll gain a working knowledge of strings in PHP, PHP string operations, and handling arrays in PHP, including PHP multidimensional arrays.

In the advanced sections, you’ll explore classes in PHP, inheritance, constructors, and destructors, handling PHP exceptions with PHP throw and catch exceptions.

Learn PHP

# Problem Statement

There are many school systems that give standardized GPA points instead of letter grades and vice versa. To bring all these institutions on the same grade scale, we have hired you! Your job is to take a **letter grade** and change it to the required **GPA point**. 

Write a method called `gpaPoint` that takes in a **string** value and returns the correct **decimal GPA point**, with respect to the scale given below:

* A+: **4**
* A: **4**
* A-: **3.7**
* B+: **3.3**
* B: **3**
* B-: **2.8**
* C+: **2.5**
* C: **2**
* C-: **1.8**
* D: **1.5**
* F: **0**

If any other grade is given, simply return a `-1`.

>Hint: Revise conditionals and see what helps keep your code short and brief.

## Input
a string grade

## Output
a floating point value corresponding to the letter grade

## Sample Input
B-

## Sample Output
2.8


# Coding Exercise
Write your code in the code widget below. If you don't get it right, don't worry; the solution is also given.

Write a function to calculate the GPA of a student when given the grade.

PHP Basics

PHP Variables

PHP Operators

PHP Conditional Statements

PHP Loops

PHP Functions

PHP Strings

PHP Arrays

PHP Assessment 1

PHP Classes

Exception Handling in PHP

PHP Assessment 2

Challenge: Letter Grade to GPA

Problem Statement