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<?php

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* MODIFICATIONS

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* - Renamed with prefix to avoid naming collisions.

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/**

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* Basic Stack Class.

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* Created for use with eqEOS. May eventually be replaced with native

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* PHP functions `array_pop()`, `array_push()`, and `end()`

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* @author Jon Lawrence <jlawrence11@gmail.com>

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* @copyright Copyright �2005-2013 Jon Lawrence

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* @license http://opensource.org/licenses/LGPL-2.1 LGPL 2.1 License

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* @package Math

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* @subpackage EOS

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* @version 2.0

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class NF_EOS_Stack {

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private $index;

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private $locArray;

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/**

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* Constructor

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* Initializes the stack

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public function __construct() {

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//define the private vars

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$this->locArray = array();

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$this->index = -1;

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}

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/**

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* Peek

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* Will view the last element of the stack without removing it

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* @return Mixed An element of the array or false if none exist

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public function peek() {

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if($this->index > -1)

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return $this->locArray[$this->index];

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else

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return false;

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}

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/**

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* Poke

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* Will add an element to the end of the stack

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* @param Mixed $data Element to add

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public function poke($data) {

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$this->locArray[++$this->index] = $data;

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}

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/**

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* Push

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* Alias of {@see Stack::poke()}

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* Adds element to the stack

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* @param Mixed $data Element to add

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public function push($data) {

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//allias for 'poke'

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$this->poke($data);

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}

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/**

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* Pop

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* Retrives an element from the end of the stack, and removes it from

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* the stack at the same time. If no elements, returns boolean false

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* @return Mixed Element at end of stack or false if none exist

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public function pop() {

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if($this->index > -1)

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{

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$this->index--;

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return $this->locArray[$this->index+1];

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}

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else

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return false;

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}

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/**

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* Clear

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* Clears the stack to be reused.

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public function clear() {

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$this->index = -1;

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$this->locArray = array();

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}

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/**

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* Get Stack

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* Returns the array of stack elements, keeping all, indexed at 0

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* @return Mixed Array of stack elements or false if none exist.

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public function getStack() {

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if($this->index > -1)

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{

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return array_values($this->locArray);

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}

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else

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return false;

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}

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}

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