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                            棧(Stack)是一種特殊的線性表，因為它只能在線性表的一端進行插入或刪除元素(即進棧和出棧)  
![](https://img.kancloud.cn/00/b0/00b02b4e08b37a199eafd46325f3ad22_214x144.png)
SplStack就是繼承雙鏈表(SplDoublyLinkedList)實現棧。
棧的遵循的規則是：先進后出
示例：
```
$stack = new SplStack(); 
$stack->push('data1'); 
$stack->push('data2'); 
$stack->push('data3'); 
echo $stack->pop();

//輸出結果為  
//data3
```

                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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