## Q. PHP Program to Find Factorial of a Given Number.

Here you will find an algorithm and program in PHP to find factorial of a number. First let us understand what factorial means.

**Explanation : **The factorial of a number is the product of all the integers from 1 to that number.

**For Example : **
Factorial of 5 is 120 i.e. 5*4*3*2*1

## Algorithm to find factorial of a given number

START step 1 : Read the number n step 2 : [Initialize] i=1, fact=1 step 3 : Repeat step 4 through 6 until i=n step 4 : fact=fact*i step 5 : i=i+1 step 6 : Print fact STOP

# PHP Program to Find Factorial of a Number

$num = 7; $fact = 1; for ($x=$num; $x>=1; $x--) { $fact = $fact * $x; } echo "Factorial of $num = $fact";

#### Output

Factorial of 7 = 5040