Explore PHP basics like Conditionals, Loops, Functions, and Arrays, then dive into advanced topics such as Classes, Inheritance, and Exception Handling to boost your programming skills.

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

In this exercise, you have to write a recursive function `fibonacci` that takes an integer `range` as a parameter and returns the $nth$ number from the [Fibonacci Sequence](https://www.mathsisfun.com/numbers/fibonacci-sequence.html) where $n$ is the value of the `range` variable.

## Input
an integer 

## Output
$nth$ value of the fibonacci sequence.
## Sample Input
```
$range = 7
```

## Sample Output
The fibonacci sequence up till the $7th$ index will be as follows:
```php
0 1 1 2 3 5 8 13
```
Therefore, the output will be:
```
13
```

# 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.

Practice your concepts of recursion by writing a function to calculate the Fibonacci sequence.

Getting Started

Variables

Operators

Conditional Statements

Loops

Functions

Strings

Arrays

PHP Assessment 1

Classes and Inheritance

Exception Handling

PHP Assessment 2

Challenge: Fibonacci Sequence

Problem Statement

Input

Output

Sample Input

Sample Output

Coding Exercise