# PHP program to calculate the factorial of a given number using recursion

Here, we are going to learn how to calculate the factorial of a given number using recursion in PHP?
Submitted by Nidhi, on November 19, 2020

In this program, we will calculate the factorial of the specified given number. The factorial of 5 is 120.
5! = 5*4*3*2*1=120

Program/Source Code:

The source code to calculate the factorial of a given number using recursion is given below. The given program is compiled and executed successfully.

```<?php
//PHP program to calculate the factorial
//of a given number using recursion.
function fact(\$num)
{
if (\$num == 1) return 1;

return \$num * fact(\$num - 1);
}

\$result = fact(5);
echo "Factorial is: " . \$result;
?>
```

Output:

```Factorial is: 120
```

Explanation:

In the above program, we created a recursive function fact() to calculate the factorial of a given number, The fact() function returns the factorial of the number to the calling function, in our program, we calculated the factorial of 5 that is 120.

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