# Find factorial of a number in PHP

In this article, we are going to learn how to find factorial of a given number using PHP program?
Submitted by IncludeHelp, on January 05, 2018

Given a number and we have to find its factorial.

Formula to find factorial: 5! (Factorial of 5) = 5x4x3x2x1 = 120

Example:

```    Input: 5
Output: 120
```

## Program to find factorial of a number in PHP

```<?php
//program to find factorial of a number
//here, we are designing a function that
//will take number as argument and return
//factorial of that number

//function: getFactorial
function getFactorial(\$num){
//declare a variable and assign with 1
\$factorial = 1;
for(\$loop = 1; \$loop <= \$num; \$loop++)
\$factorial = \$factorial * \$loop;
return \$factorial;
}

//Main code to test above function
\$number = 1;
print_r("Factorial of ".\$number. " is = ".getFactorial(\$number). "\n");
\$number = 2;
print_r("Factorial of ".\$number. " is = ".getFactorial(\$number). "\n");
\$number = 3;
print_r("Factorial of ".\$number. " is = ".getFactorial(\$number). "\n");
\$number = 4;
print_r("Factorial of ".\$number. " is = ".getFactorial(\$number). "\n");
\$number = 5;
print_r("Factorial of ".\$number. " is = ".getFactorial(\$number). "\n");
?>
```

Output

```Factorial of 1 is = 1
Factorial of 2 is = 2
Factorial of 3 is = 6
Factorial of 4 is = 24
Factorial of 5 is = 120
```