PHP Program to find Factorial of a Number

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What is Factorial of a Number?

The factorial of a number n can be defined as the product of all positive numbers less than or equal to n. For example, the factorial of 6 is 1 × 2 × 3 × 4 × 5 × 6 = 720.


The following table provides few examples of factorial of a number.

2!1 × 22
3!1 × 2 × 36
4!1 × 2 × 3 × 424

Note: In Mathematics, factorial of a number is represented by exclamation mark.

Tips: It is recommended to use our online Factorial of a Number calculator for better understanding.

Find a Factorial of a Number

In the following example, we will find a factorial of a number 6.


PHP Compiler
<?php $num = 6; $i = 1; $factorial = 1; for($i=1; $i<=$num; $i++) $factorial *= $i; if($num) echo "Factorial of $num: $factorial"; else echo "Factorial of 0 is 0"; ?>


Factorial of 6: 720


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