Addition Example: 5 + 5
10
Subtraction Example: 5 + 5
5
Multiplication Example: 5 * 5
25
Division Example: 25 / 5
5
Modulus Example: Remainder of 123/20
3
Increment Example: 5 incremented by 1
6
Decrement Example: 10 decremented by 1
9

The PHP arithmetic operators are used for calculating mathematical equations.
The additon operator adds two digits together.
The subtraction operator takes the sum of one value minus another.
The multiplication operator takes the product of two digits.
The division operator takes one product divided by another.
The Modulus operator finds the remained from the value of one digit divided by another.
The increment operator counts in increments of 1 from 0 to 5.
The decrement operator counts in increments of 1 from 10 to 0.