PHP arithmetic operators

arithmetic.php

<!-- 
    PHP Arithmetic Operators

The PHP arithmetic operators are used with numeric values to perform common 
arithmetical operations, such as addition, subtraction, multiplication etc.

+ 	Addition 	    $x + $y 	Sum of $x and $y 	
- 	Subtraction 	$x - $y 	Difference of $x and $y 	
* 	Multiplication 	$x * $y 	Product of $x and $y 	
/ 	Division 	    $x / $y 	Quotient of $x and $y 	
% 	Modulus 	    $x % $y 	Remainder of $x divided by $y 	
** 	Exponentiation 	$x ** $y 	Result of raising $x to the $y'th power (Introduced in PHP 5.6)

PHP Increment / Decrement Operators

The PHP increment operators are used to increment a variable's value.

The PHP decrement operators are used to decrement a variable's value.

++$x 	Pre-increment 	Increments $x by one, then returns $x 	
$x++ 	Post-increment 	Returns $x, then increments $x by one 	
--$x 	Pre-decrement 	Decrements $x by one, then returns $x 	
$x-- 	Post-decrement 	Returns $x, then decrements $x by one
 -->

<?php
$x=20;
$y=15;

//addition
$add=$x+$y;
echo $add.'<br>';

//subtraction
$sub=$x-$y;
echo $sub.'<br>';

//multiplication
$mult=$x*$y;
echo $mult.'<br>';

//division
$div=$x/$y;
echo $div.'<br>';


//modulus
$mod=$x%$y;
echo $mod.'<br>';

//Exponentiation

$exp=$x**$y;
echo $exp.'<br>';

$num=20;
$num2=10;

//Pre-increment
echo ++$num.'<br>';
//post-increment
echo $num++.'<br>';
echo $num.'<br>';

//Pre-decrement
echo --$num2.'<br>';

//Post-decrement
echo $num2--.'<br>';
echo $num2.'<br>';



?>