This beginner-friendly course is your best tool to learn PHP from scratch.

This highly interactive course introduces you to fundamental programming concepts in PHP, one of the most popular languages in the world. It begins with a simple Hello world program and proceeds on to cover common concepts such as Conditional Statements, Loop Statements, and Logic in PHP. 

It then reflects upon the idea of Functions and Arrays, as well as the power they give to the programmer to write better code. 

Finally, it dives deeper in order to teach about advanced concepts such as Classes, Inheritance and Exception Handling in PHP. By the time you're done, you'll have a good grip on the basics of PHP, and will be ready to study advanced concepts.

Learn PHP from Scratch

# Problem Statement
Write a PHP function `sum` that takes two integer parameters and returns their sum.

## Input
two numbers

## Output
sum of the two numbers

## Sample Input
```
4, 5
```

## Sample Output
```
9
```

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

Write a function to calculate the sum of two numbers.

Getting Started

Variables

Operators

Conditional Statements

Loops

Functions

Strings

Arrays

PHP Assessment 1

Classes and Inheritance

Exception Handling

PHP Assessment 2

Challenge: Sum of two Numbers

Problem Statement

Input

Output

Sample Input

Sample Output

Coding Exercise