Alternator Class - useful for alternating colours or other linear recurrencing items

Alternator.php

<?php

class Alternator {
		
	// The values that are to be alternated.
	private $values = array();

	// Count of the array, used to increase performance.
	private $count = 0;

	// The current index. Starts as -1 so the first index will be 0.
	private $cur = -1;

	// Creates new instances of the Alternator.
	public function __construct($values) {
		$this->values = $values;
		$this->count = count($values);
	}

	// Gets the next value in the rotation.
	public function go() {
		return $this->values[$this->cur = ++$this->cur % $this->count];
	}

	// Resets the Alternator
	public function reset() {
		$this->cur = 0;
	}
		
}