php SPL标准库数据结构

//栈（后进先出）$stack =new SplStack();$stack->push("data1");$stack->push("data2");echo $stack->pop();echo $stack->pop();//队列(先进先出)$queue = new SplQueue();$queue->enqueue("aaaaaa");$queue->enqueue("bbbbbb");echo $queue->dequeue();echo $queue->dequeue();//最小堆(从小到大)$heap = new SplMinHeap();$heap->insert("555");$heap->insert("444");echo $heap->extract();echo $heap->extract();//最大堆(从大到小)$maxHeap = new SplMaxHeap();$maxHeap->insert(888);$maxHeap->insert(999);echo $maxHeap->extract();echo $maxHeap->extract();//固定长度的数组$array = new SplFixedArray(10);$array[0] = 111;$array[8] = 888;var_dump($array);