<?php

$stack = new SplStack();

$stack->push('1');
$stack->push('2');
$stack->push('3');

echo '<pre>';
echo $stack->count();
echo "\n";
echo $stack->top();
echo "\n";
echo $stack->bottom();
echo "\n";
echo $stack->serialize();
echo "\n";
echo $stack->pop();
echo "\n";
echo $stack->pop();
echo "\n";
echo $stack->count();
echo '</pre>';

//while ($stack->pop())