Factorial Of A Number

Write a PHP program to print the factorial of a number

Factorial of a number n is defined by the product of all the numbers from 1 to n (including 1 and n).

Example

Number Is 5
Get Factorial Steps
5*4*3*2*1

Output:
120

Logic:

• Take a number.
• Take the descending positive integers.
• Multiply them.

Program

<?php
$number=6;  
$factValue = 1;  
for ($i=1; $i<=$number; $i++)   
{  
  $factValue = $factValue * $i;  
}  
echo "Factorial of $number is $factValue";  
?>

Output

Factorial of 6 is 720

Factorial Of A Number Using Function

<?php
function getFactorial($number=""){
    $factValue = 1;  
    for ($i=1; $i<=$number; $i++)   
    {  
      $factValue = $factValue * $i;  
    }  
    echo "Factorial of $number is $factValue";
}
getFactorial(8);
?>

 Output

Factorial of 8 is 40320