To perform arithmetic operations PHP has operators that performs the task.

### Operators

#### Addition Operator

As the name says, **arithmetic operator** performs arithmetic operation. The **symbol of addition operator** is +

**Example**

<?php

$num1=10;

$num2=20;

echo $num1+$num2;

?>

Output:30

#### Subtraction Operator

Subtraction Operator performs subtraction operation. The symbol of **subtraction operator** is –

**Example**

<?php

$num1=20;

$num2=10;

echo $num1-$num2;

?>

Output: 10

#### Multiplication Operator

Multiplication operator performs multiplication operation. The symbol of **multiplication operator** is *

**Example**

<?php

$num1=5;

$num2=10;

echo $num1*$num2;

?>

Output: 50

#### Division Operator

Division operator performs division operations. The symbol of **division operator** is /

Example

<?php

$num1=100;

$num2=50;

echo $num1/$num2;

?>

Output:2

#### Modulus Operator

Modulus Operator performs modulus operation. The symbol of **modulus operator** is %

What is modulus operation?

Modulus operation gives us the remainder of division of two numbers.

Example

<?php

$num1=25;

$num2=10;

echo $num1%$num2;

?>

Looking at the above code we can say the remainder will be 5.

So using Modulus operator, we can get the remainder of division of two numbers.

#### Increment Operator

To understand what is an **Increment Operator**, lets consider a simple situation. A requirement came to increment a value by 1 then how could we achieve this?

<?php

$num1=10;

$num1=$num1+1;

echo $num1;

?>

Output: 11

Note: In the second line of the above code, we have added 1 to the value of the variable name $num1 and then we assigned back to itself that is $num1. ($num1=$num1+1);

Now, the below code is also going to provide us the same result.

<?php

$num1=10;

$num1++;

echo $num1;

?>

Output:11

Note: Look at the second line in the above example. There is a double plus symbol beside to the variable name. This double plus sign is known as increment operator.

$num1++ is equivalent to $num1=$num1+1

**What does an increment operator do?**

An increment operator increments the value of the variable by 1.

#### Decrement Operator

Decrement operator is similar to increment operator except it decrements the value of the variable by 1. And the symbol for** decrement operator** is double minus sign —

**Example**

Decrement the value of variable by 1

<?php

$num1=10;

$num1–;

echo $num1;

?>

Output: 9