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                            ## 3.3.1.直接使用：
```
echo  常量名；		//注意：使用常量，前面不帶”$”符號，也不能有引號
```
## 3.3.2.使用constant()函數以取值：
```
echo  constant(‘常量名’);		//注意，此時常量名要用引號引起來。
```
![](https://img.kancloud.cn/01/f5/01f57589d8e6da46c601e26090746d46_778x515.png)
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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