Write a factorial program using for loop in php

Description: Write a PHP program to calculate the factorial of a number using a for loop.

Rules and hints:

• Factorial of 5 is 5 x 4 x 3 x 2 x 1 = 120.
• Use a loop that multiplies the numbers one by one.

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PHP program for factorial using a for loop

<?php
$num = 5;
$factorial = 1;

for ($x = $num; $x >= 1; $x--) {
    $factorial = $factorial * $x;
}

echo "The factorial of " . $num . " is " . $factorial;
?>

Output:

How it works

• $factorial starts with 1.
• The loop goes from 5 down to 1, and multiplies $factorial with each number.
• The factorial of 0 is 1, and this program gives 1 for it too, because the loop does not run.

Another way is to use a function that calls itself: factorial using recursion.

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