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                            我們可以在類中定義常量。常量的值將始終保持不變。在定義和使用常量的時候不需要使用`$`符號。

~~~php
<?php

class A
{
    const ENV = 'env';
    const HELLO = 'Hello';
}

~~~

接口（interface）中也可以定義常量

~~~php
<?php

interface B
{
    const ENV = 'ENV';
    public function sayHi();
}
~~~
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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