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
**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.

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: Print a Matrix

Problem Statement #

Function Prototype #