The factorial of a given number

factorial.php

<?php
function factorial($n) {
			$factorial = 1;
				for($i = $n; $i >= 1; $i--){
					$factorial = $factorial * $i;
					
				}
			echo "Factorial of $n is $factorial";
		}
	  //calling the function
			factorial(5);
			
		//returns 120