PHP implements multiple inheritance through interfaces

PHP is a single-weight inheritance. A class has only one parent class.

However, multiple inheritance can be implemented through interfaces.

Defines an interface in which there are methods, if the interface is implements to the class, then that class needs to have an interface method. Just like the following code

<? PHP     Interface d{        function B ();    }     class a implements d{        function B () {}    }?>

However, if the class A does not have function B, it will get an error.

Fatal Error: Class A contains 1 abstract method and must therefore be declared abstract or implement the remain ing methods (d::b) in E:\php\WWW\demo.php on line 6

PHP implements multiple inheritance through interfaces