FizzBuzz

fizzbuzz.php

<?php
interface RuleInterface
{
	public function verify($i);
	
	public function output($i);
}

class DefaultRule implements RuleInterface
{
	public function verify($i)
	{
		return true;
	}
	
	public function output($i)
	{
		return $i;
	}
}

class FizzRule implements RuleInterface
{
	public function verify($i)
	{
		return (bool) ($i % 3 === 0);
	}
	
	public function output($i)
	{
		return 'fizz';
	}
}

class BuzzRule implements RuleInterface
{
	public function verify($i)
	{
		return (bool) ($i % 5 === 0);
	}
	
	public function output($i)
	{
		return 'buzz';
	}	
}

class WhizzRule implements RuleInterface
{
	public function verify($i)
	{
		return (bool) ($i % 7 === 0);
	}
	
	public function output($i)
	{
		return 'whizz';
	}	
}

class FizzBuzzRule implements RuleInterface
{
	public function verify($i)
	{
		return (bool) ($i % 15 === 0);
	}
	
	public function output($i)
	{
		return 'fizzbuzz';
	}	
}

class FizzBuzz
{
	protected $rules = array();
	
	public function addRule(RuleInterface $rule)
	{
		$this->rules[] = $rule;
		
		return $this;
	}
	
	public function generate($n)
	{
		$output = array();
		
		for ($i = 1; $i <= $n; $i++) {
			$output[] = $i;
			
			foreach ($this->rules as $j => $rule) {
				if ($rule->verify($i)) {
					$output[$i - 1] = $rule->output($i);
				}
			}
		}
		
		return $output;
	}
}

$a = new FizzBuzz();
$a
	->addRule(new FizzRule())
	->addRule(new BuzzRule())
	->addRule(new WhizzRule())
	->addRule(new FizzBuzzRule())
	;

print_r($a->generate(15));
?>