doushi2902
doushi2902
2017-06-16 16:03

PHP OOP继承问题

已采纳

I have an inheritance issue. Consider I have a parent class A and a derived class B from A and a derived Class C from A again.

Let's say, class B & C both override method seed() from class A. Also clases A & B & C all implement a static function seedAll().

My question is: How do I call seedAll for B & C from the seedAll function of A without explicitly specifying the class B & C, so that in the future, should I have a class D similar to class B & C, I need not modify the seedAll function of class A to call the seedAll functions of classes B, C & D.

abstract class A
{
    public static function seedAll() {
        //How do I call seedAll of all the derived classes of Seeder?
    }

    abstract protected function seed();
    // // Common method
    // public function printOut() {
    //     print $this->getValue() . "
";
    // }
}

class B extends A
{
    private $name;

    function __construct($name) {
        $this->name = $name;
    }

    public static function seedAll() {
        $seeder1 = new B("name1");
        $seeder1 = new B("name2");
    }

    function seed() {
        echo $this->name;
    }
}


  class C extends A
    {
        private $name;

        function __construct($name) {
            $this->name = $name;
        }

        public static function seedAll() {
            $seeder1 = new C("name1");
            $seeder1 = new C("name2");
        }

        function seed() {
            echo $this->name;
        }
    }
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1条回答

  • drzip28288 drzip28288 4年前

    See how to obtain all subclasses of a class in php for how to get all the subclasses. You can then loop over them and call their seedAll() methods.

    abstract class A
    {
        public static function seedAll() {
            $subclasses = getSubclassesOf("A");
            foreach ($subclasses as $class) {
                $class::seedAll();
            }
        }
    
        abstract protected function seed();
        // // Common method
        // public function printOut() {
        //     print $this->getValue() . "
    ";
        // }
    }
    

    getSubclassesOf function:

    function getSubclassesOf($parent) {
        $result = array();
        foreach (get_declared_classes() as $class) {
            if (is_subclass_of($class, $parent))
                $result[] = $class;
        }
        return $result;
    }
    
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