fizzbuzz2.php

<?php

/*
 * Task:
 * Write a program that prints the numbers from 1 to 100. But for multiples of three print "Fizz" instead of the number and for the multiples of five print "Buzz".
 * For numbers which are multiples of both three and five print "FizzBuzz".
 *
 * Instructions:
 * This file (fizzbuzz.php) can be uploaded to a webserver that's running PHP4+ and executed with "php fizzbuzz.php" from the command line.
 * Alternatively, this file can be accessed directly (if webserver permissions allow) via your browser.
 *
 * Author: Mike Mackenzie <mike@veb.co.nz>
 */


for ($i = 1; $i <= 100; $i++)
{

    /*
     * Using modular arithmetic we can easily compare the given conditions with the integer in the loop to determine the modulus.
     * The conditions are 3, 5 and 15. We can use 15 (instead of two big conditional statements) as the aforementioned 3 and 5 are two
     * distinct prime factors of 15.
     *
     * This implementation is slower, and over engineered, but I wrote it on the principle that you should be able to add more conditions.
     * I wanted to keep the code small, and following the DRY principle. I know that this is only limited to if you want to add more modulus
     * conditions, or change the text returned. Not a good implementation for production.
     */
    $cond['Fizz'] = 3;
    $cond['Buzz'] = 5;

    $x = $i;
    foreach($cond as $k => $v) {
        if ($i % $v == 0) {
            echo $k;
            $x = null;
        }
    }
    echo "$x <br/>\n";
}
?>