What does the php interface do?

php Interface class: interface

In fact, their role is very simple. When many people develop a project together, they may all call some classes written by others. Then you will ask, how do I know how to name the implementation method of a certain function? At this time, the php interface class comes into play. When we define an interface class, The methods in it The following subclasses must be implemented

The code is as follows: (Recommended learning:PHP programming from entry to proficiency)

interface Shop 
{ 
public function buy($gid); 
public function sell($gid); 
public function view($gid); 
}

I declare a shop interface class , three methods are defined: buy, sell, and view. Then all subclasses that inherit this class must implement any of these three methods. If the subclass does not implement these, It won't work.

ActuallyThe interface class is, to put it bluntly, the template of a class and the regulations of a class. If you belong to this category, you must follow my regulations, even if one is missing, but I don’t care how you do it, that’s your business. For example:

The code is as follows:

class BaseShop implements Shop 
{ 
    public function buy($gid) 
    { 
        echo('你购买了ID为 :'.$gid.'的商品'); 
    } 
    public function sell($gid) 
    { 
        echo('你卖了ID为 :'.$gid.'的商品'); 
    } 
    public function view($gid) 
    { 
        echo('你查看了ID为 :'.$gid.'的商品'); 
    } 
}

If you think about it, in a large project with multiple people cooperating, there is an interface. Classes are so convenient, so you don't have to ask others what the method name of your certain function is. Of course, if you like this, I can't help it.

Conclusion: The interface class is the leader of a class, indicating the direction, and the subclass must complete its specified method.

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