Program to check factorial of 5 in php?

<?php
function factorial($n) {
    $result = 1;
    for ($i = 1; $i <= $n; $i++) {
        $result *= $i;
    }
    return $result;
}
$number = 5;
echo "Factorial of $number is " . factorial($number);
?>

Output:

Factorial of 5 is 120