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                            雙鏈表 (DLL) 是一個鏈接到兩個方向的節點列表。當底層結構是 DLL 時, 迭代器的操作、對兩端的訪問、節點的添加或刪除都具有 O (1) 的開銷。因此, 它為棧和隊列提供了一個合適的實現。
![](https://img.kancloud.cn/b2/e3/b2e35a63022893287e30ddb188a0d84e_423x119.png)

```
$list = new SplDoublyLinkedList(); 
$list->push('a'); 
$list->push('b'); 
$list->push('c'); 
$list->push('d'); 
$list->unshift('top'); 
$list->shift(); 
print_r(array( 
     'pop'         => $list->pop(),
     'count'       => $list->count(),
     'isEmpty'     => $list->isEmpty(),
     'bottom'      => $list->bottom(),
     'top'         => $list->top()
 )); 

#輸出結果 
Array (
    [pop] => d 
    [count] => 3 
    [isEmpty] => 
    [bottom] => a 
    [top] => c 
)
```
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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