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();