fizzbuzz.php

fizzbuzz.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.
     */

    if ($i % 3 == 0)
        echo "Fizz";
    else if ($i % 5 == 0)
        echo "Buzz";
    else if ($i % 15 == 0)
        echo "FizzBuzz";
    else
        echo $i;

    echo "<br>\n";
}

?>

Demo: http://veb.nz/fizz.php