How to find factorial of given number using PHP

In mathematics, the factorial function (symbol: !) says to multiply all whole numbers from our chosen number down to 1.
Example : Factorial of 5 is –
5! = 5 x 4 x 3 x 2 x 1 = 120

Let’s achieve this with PHP –

<?php
$fact =1;
$n = 5;  // user input
for($i=1; $i<=$n; $i++)
 {
    $fact = $fact * $i;
  }
echo $fact;

// Output
// 120

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