Input
Output
<?php // Define the number $originalNumber = 153; $number = $originalNumber; $sum = 0; $digits = strlen((string)$number); // Calculate the sum of the power of digits while ($number > 0) { $digit = $number % 10; $sum += pow($digit, $digits); $number = (int)($number / 10); } // Check if it's an Armstrong number if ($sum == $originalNumber) { echo "$originalNumber is an Armstrong number."; } else { echo "$originalNumber is NOT an Armstrong number."; } ?>