Arithmetic Operators

Please read the variables and the echo function tutorials first.

This is basically a tutorial on how to do maths in PHP.

We’ll start off with our basic PHP tags:

<?php

?>

And we’ll add two variables:

<?php
$number_1 = 5;
$number_2 = 10;
?>

We’ll then echo both variables:

<?php
$number_1 = 5;
$number_2 = 10;

echo $number_1 $number_2;

?>

And in between them, we can add either a +, -, * (for times) and / (for devided):

<?php
$number_1 = 5;
$number_2 = 10;

echo $number_1 + $number_2;

?>

If you then preview the code, you’ll see the answer.

We can now make things a little more complicated. We’ll add two new variables:

<?php
$number_1 = 5;
$number_2 = 10;
$number_3 = 7;
$number_4 = 3;
?>

And we’ll add and then add again, and then divide:

<?php
$number_1 = 5;
$number_2 = 10;
$number_3 = 7;
$number_4 = 3;

echo $number_1 + $number_2 + $number_3 / $number_4;

?>

You can also reuse the same variable multiple times.