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.

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# 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.

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: Fibonacci Sequence

Problem Statement