有关spl的总结

$stack = new SplStack();
$stack->push('data1');
$stack->push('data2');
echo $stack->pop();
echo $stack->pop();
$queen = new SplQueue();
$queen->enqueue('data1');
$queen->enqueue('data2');
//打印出队列
echo $queen->dequeue().'<br/>';
echo $queen->dequeue();
$heap = new SplMinHeap();
$heap->insert('data1');
$heap->insert('data2');
$heap->insert('data3');
$heap->insert('data4');
$heap->insert('data5');
echo $heap->extract();
echo $heap->extract();
echo $heap->extract();
echo $heap->extract();
echo $heap->extract();