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
**Print** a two-dimensional array of size **n x n** as shown below in the form of a matrix. 

## Function Prototype
```php
function printMat($n)
```
## Input
an integer
## Output
print matrix on the console
## Sample input
```php
$n = 3;
```
## Sample output

*Print* an array of size 3 x 3 as:
* The *diagonal* of the *array* should be filled with **0**. 
* The *lower side* should be filled with **-1s**. 
* *upper side* should be filled with **1s**.

**Make sure to put spaces between the values and print each row in the next line**

```
0 1 1 \n-1 0 1 \n-1 -1 0 \n
```
>**Note:** In order to move a value to the next line you can use `PHP_EOL`.


Solve the following challenge to print a matrix, i.e., a two-dimensional array.

Getting Started

Variables

Operators

Conditional Statements

Loops

Functions

Strings

Arrays

PHP Assessment 1

Classes and Inheritance

Exception Handling

PHP Assessment 2

Challenge: Print a Matrix

Problem Statement #

Function Prototype #

Input #

Output #

Sample input #

Sample output #