PHP Math

<?php

# Set some variables.
$x = 5;
$y = 8;

# Addition: use the 'plus' symbol.
echo $x + $y;
echo '<br>';

# Subtraction: use the 'minus' symbol.
echo $y - $x;
echo '<br>';

# Multiplication: use the 'asterisk' symbol.
echo $x * $y;
echo '<br>';

# Division: use the 'forward slash' symbol.
echo $x / $y;
echo '<br>';

# Modulus: use the 'percent' symbol.
echo $y % $x;
echo '<br>';

# Power: use two 'asterisk' symbols to calculate one number to the power of another.
echo $x ** $y;

?>