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                            ### 位運算
運算符
![](https://box.kancloud.cn/09022c29ac4885a93a7e3e691dd95381_876x321.png)
#### 二進制——原碼，反碼，補碼
1. 二進制的最高位的符號位：0表示正數，1表示負數
2. 正數的原碼，反碼，補碼都一樣
3. 負數的反碼=它的原碼符號位不變，其他位**取反**，0——》1,1——》0
4. 負數的補碼=他的**反碼+1**
5. 0的反碼，補碼都是0
6. php沒有無符號數，php的數都是有符號的
7. 在計算機的運算的時候，都是以**補碼**的形式運算的

![](https://box.kancloud.cn/fe3443c8a3b17623e521bb0f9afc64b3_442x228.png)
![](https://box.kancloud.cn/b319cf83f891f470eb521bcd1f1c9971_375x75.png)

![](https://box.kancloud.cn/ea0769f98b1a9693e4475671a6d19106_369x230.png)


                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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