php中SPL常用的数据结构详解

<span style="font-size:18px;">$stack = new SplStack();  
$stack->push('data1');  
$stack->push('data2');  
$stack->push('data3');  
echo $stack->pop();  
  
//输出结果为  
//data3</span><span style="font-size:24px;font-weight: bold;">  
</span>

<span style="font-size:18px;">$queue = new SplQueue();  
$queue->enqueue("data1");  
$queue->enqueue("data2");  
$queue->enqueue("data3");  
echo $queue->dequeue();  
//输出结果为  
//data1</span>

<span style="font-size:18px;">$heap = new SplMinHeap();  
$heap->insert("data1");  
$heap->insert("data2");  
echo $heap->extract();  
//输出结果为  
//data1</span>

<span style="font-size:18px;">$array = new SplFixedArray(5);  
$array[0]=1;  
$array[3]=3;  
$array[2]=2;  
var_dump($array);  
//输出结果为  
// object(SplFixedArray)[1]  
// public 0 => int 1  
// public 1 => null  
// public 2 => int 2  
// public 3 => int 3  
// public 4 => null</span>