Factorial in PHP

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Q. Write a PHP program to find the factorial of a number

<?php
// Define the number
$number = 5;
$factorial = 1;

// Calculate factorial using loop
if ($number < 0) {
    echo "Factorial is not defined for negative numbers.";
} else {
    for ($i = 1; $i <= $number; $i++) {
        $factorial *= $i;
    }
    echo "Factorial of $number is: $factorial";
}
?>
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Q. Write an algorithm to find the factorial of a number in PHP

1. Start
2. Define an integer number
3. If number < 0, print "Factorial not defined" and stop
4. Set factorial = 1
5. Loop from i = 1 to number:
    a. Multiply factorial = factorial * i
6. Print factorial
7. End
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