PHP implementation of a queue.

Queue.class.php

<?php

// http://www.cplusplus.com/reference/queue/queue/

class Queue {
	private $_queue = array();

	public function size() {
		return count($this->_queue);
	}

	public function front() {
		return end($this->_queue);
	}

	public function back() {
		return reset($this->_queue);
	}

	public function push($value = NULL) {
		array_unshift($this->_queue, $value);
	}

	public function pop() {
		return array_pop($this->_queue);
	}

	public function isEmpty() {
		return empty($this->_queue);
	}
}