Question

How to use class static methods and inheritance in PHP

Answer 1

class Dog {
    public static function whatYouSay() {
         echo '(Dog) Woof! Woof!';
    }

    public static function speak() {
         self::whatYouSay();
    }
}

class Labrador_Retriever extends Dog {
    public static function whatYouSay() {
         echo '(Labrador_Retriever) Woof! Woof! Woof! Woof!';
    }
}

Dog::speak(); 
echo "<br />";
Labrador_Retriever::speak();
 
/*
run: 
  
(Dog) Woof! Woof!
(Dog) Woof! Woof!
  
*/  

 

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Answer 2

class Dog {
    public static function whatYouSay() {
         echo '(Dog) Woof! Woof!';
    }

    public static function speak() {
         static::whatYouSay();
    }
}

class Labrador_Retriever extends Dog {
    public static function whatYouSay() {
         echo '(Labrador_Retriever) Woof! Woof! Woof! Woof!';
    }
}

Dog::speak(); 
echo "<br />";
Labrador_Retriever::speak();
 
/*
run: 
  
(Dog) Woof! Woof!
(Labrador_Retriever) Woof! Woof! Woof! Woof!
  
*/  

 

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