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<?php

class Stack

{

public function isEmpty(){

return $this->size === 0;

}

private $value = array();

private $size = 0;

public function push($value){

$this->value[$this->size++] = $value;

}

public function top(){

$this->emptyCheck();

return $this->value[$this->size - 1];

}

public function size(){

return $this->size;

}

public function pop(){

$this->emptyCheck();

--$this->size;

}

private function emptyCheck() {

if($this->isEmpty()){

throw new EmptyStackException();

}

}

}

class EmptyStackException extends Exception

{

}