What is the arithmetic operators in PHP?

`<?php`

$a + $b // sum of $a and $b

$a - $b // Difference $a and $b

$a * $b // Multiplication $a and $b

$a / $b // Division $a and $b

?>

There is another arithmetic operator PHP, so-called integer remainder of a division.

`<?php`

$a % $b

?>

If we divide 5 for example by 2, we get 2.5 and 5% 2, we get 1 (which is the residue left):

`<?php`

echo 5 / 2 // we get 2.5

echo 5 % 2 // we get 1

?>