PHP 数据结构

        //栈结构，先进后出
	$stack 		= new SplStack();
	//入
	$stack->push("data1<br>");
	$stack->push("data2<br>");

	echo $stack->pop();
	echo $stack->pop();

	//队列，先进先出
	$queue 		= new SplQueue();
	//入
	$queue->enqueue(‘data1<br>‘);
	$queue->enqueue(‘data2<br>‘);

	echo $queue->dequeue();
	echo $queue->dequeue();


	//堆结构，先进先出
	$heap 		= new SplMinHeap();
	//入
	$heap->insert(‘data1<br>‘);
	$heap->insert(‘data2<br>‘);

	echo $heap->extract();
	echo $heap->extract();


	//固定尺寸数组
	$array 		= new SplFixedArray(10);
	$array[0] 	= 1;
	$array[9] 	= 10;

	var_dump($array);